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<title>Lexical Analysis With Flex: Top</title>
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<h1 class="settitle" align="center">Lexical Analysis With Flex</h1>
<a name="SEC_Contents"></a>
<h2 class="contents-heading">Table of Contents</h2>
<div class="contents">
<ul class="no-bullet">
<li><a name="toc-Copyright-1" href="Copyright.html#Copyright">1 Copyright</a></li>
<li><a name="toc-Reporting-Bugs-1" href="Reporting-Bugs.html#Reporting-Bugs">2 Reporting Bugs</a></li>
<li><a name="toc-Introduction-1" href="Introduction.html#Introduction">3 Introduction</a></li>
<li><a name="toc-Some-Simple-Examples" href="Simple-Examples.html#Simple-Examples">4 Some Simple Examples</a></li>
<li><a name="toc-Format-of-the-Input-File" href="Format.html#Format">5 Format of the Input File</a>
<ul class="no-bullet">
<li><a name="toc-Format-of-the-Definitions-Section" href="Definitions-Section.html#Definitions-Section">5.1 Format of the Definitions Section</a></li>
<li><a name="toc-Format-of-the-Rules-Section" href="Rules-Section.html#Rules-Section">5.2 Format of the Rules Section</a></li>
<li><a name="toc-Format-of-the-User-Code-Section" href="User-Code-Section.html#User-Code-Section">5.3 Format of the User Code Section</a></li>
<li><a name="toc-Comments-in-the-Input-1" href="Comments-in-the-Input.html#Comments-in-the-Input">5.4 Comments in the Input</a></li>
</ul></li>
<li><a name="toc-Patterns-1" href="Patterns.html#Patterns">6 Patterns</a></li>
<li><a name="toc-How-the-Input-Is-Matched" href="Matching.html#Matching">7 How the Input Is Matched</a></li>
<li><a name="toc-Actions-1" href="Actions.html#Actions">8 Actions</a></li>
<li><a name="toc-The-Generated-Scanner" href="Generated-Scanner.html#Generated-Scanner">9 The Generated Scanner</a></li>
<li><a name="toc-Start-Conditions-1" href="Start-Conditions.html#Start-Conditions">10 Start Conditions</a></li>
<li><a name="toc-Multiple-Input-Buffers-1" href="Multiple-Input-Buffers.html#Multiple-Input-Buffers">11 Multiple Input Buffers</a></li>
<li><a name="toc-End_002dof_002dFile-Rules" href="EOF.html#EOF">12 End-of-File Rules</a></li>
<li><a name="toc-Miscellaneous-Macros" href="Misc-Macros.html#Misc-Macros">13 Miscellaneous Macros</a></li>
<li><a name="toc-Values-Available-To-the-User" href="User-Values.html#User-Values">14 Values Available To the User</a></li>
<li><a name="toc-Interfacing-with-Yacc" href="Yacc.html#Yacc">15 Interfacing with Yacc</a></li>
<li><a name="toc-Scanner-Options-1" href="Scanner-Options.html#Scanner-Options">16 Scanner Options</a>
<ul class="no-bullet">
<li><a name="toc-Options-for-Specifying-Filenames-1" href="Options-for-Specifying-Filenames.html#Options-for-Specifying-Filenames">16.1 Options for Specifying Filenames</a></li>
<li><a name="toc-Options-Affecting-Scanner-Behavior-1" href="Options-Affecting-Scanner-Behavior.html#Options-Affecting-Scanner-Behavior">16.2 Options Affecting Scanner Behavior</a></li>
<li><a name="toc-Code_002dLevel-And-API-Options-1" href="Code_002dLevel-And-API-Options.html#Code_002dLevel-And-API-Options">16.3 Code-Level And API Options</a></li>
<li><a name="toc-Options-for-Scanner-Speed-and-Size-1" href="Options-for-Scanner-Speed-and-Size.html#Options-for-Scanner-Speed-and-Size">16.4 Options for Scanner Speed and Size</a></li>
<li><a name="toc-Debugging-Options-1" href="Debugging-Options.html#Debugging-Options">16.5 Debugging Options</a></li>
<li><a name="toc-Miscellaneous-Options-1" href="Miscellaneous-Options.html#Miscellaneous-Options">16.6 Miscellaneous Options</a></li>
</ul></li>
<li><a name="toc-Performance-Considerations" href="Performance.html#Performance">17 Performance Considerations</a></li>
<li><a name="toc-Generating-C_002b_002b-Scanners" href="Cxx.html#Cxx">18 Generating C++ Scanners</a></li>
<li><a name="toc-Reentrant-C-Scanners" href="Reentrant.html#Reentrant">19 Reentrant C Scanners</a>
<ul class="no-bullet">
<li><a name="toc-Uses-for-Reentrant-Scanners" href="Reentrant-Uses.html#Reentrant-Uses">19.1 Uses for Reentrant Scanners</a></li>
<li><a name="toc-An-Overview-of-the-Reentrant-API" href="Reentrant-Overview.html#Reentrant-Overview">19.2 An Overview of the Reentrant API</a></li>
<li><a name="toc-Reentrant-Example-1" href="Reentrant-Example.html#Reentrant-Example">19.3 Reentrant Example</a></li>
<li><a name="toc-The-Reentrant-API-in-Detail" href="Reentrant-Detail.html#Reentrant-Detail">19.4 The Reentrant API in Detail</a>
<ul class="no-bullet">
<li><a name="toc-Declaring-a-Scanner-As-Reentrant" href="Specify-Reentrant.html#Specify-Reentrant">19.4.1 Declaring a Scanner As Reentrant</a></li>
<li><a name="toc-The-Extra-Argument" href="Extra-Reentrant-Argument.html#Extra-Reentrant-Argument">19.4.2 The Extra Argument</a></li>
<li><a name="toc-Global-Variables-Replaced-By-Macros" href="Global-Replacement.html#Global-Replacement">19.4.3 Global Variables Replaced By Macros</a></li>
<li><a name="toc-Init-and-Destroy-Functions-1" href="Init-and-Destroy-Functions.html#Init-and-Destroy-Functions">19.4.4 Init and Destroy Functions</a></li>
<li><a name="toc-Accessing-Variables-with-Reentrant-Scanners" href="Accessor-Methods.html#Accessor-Methods">19.4.5 Accessing Variables with Reentrant Scanners</a></li>
<li><a name="toc-Extra-Data-1" href="Extra-Data.html#Extra-Data">19.4.6 Extra Data</a></li>
<li><a name="toc-About-yyscan_005ft-1" href="About-yyscan_005ft.html#About-yyscan_005ft">19.4.7 About yyscan_t</a></li>
</ul></li>
<li><a name="toc-Functions-and-Macros-Available-in-Reentrant-C-Scanners" href="Reentrant-Functions.html#Reentrant-Functions">19.5 Functions and Macros Available in Reentrant C Scanners</a></li>
</ul></li>
<li><a name="toc-Incompatibilities-with-Lex-and-Posix" href="Lex-and-Posix.html#Lex-and-Posix">20 Incompatibilities with Lex and Posix</a></li>
<li><a name="toc-Memory-Management-1" href="Memory-Management.html#Memory-Management">21 Memory Management</a>
<ul class="no-bullet">
<li><a name="toc-The-Default-Memory-Management-1" href="The-Default-Memory-Management.html#The-Default-Memory-Management">21.1 The Default Memory Management</a></li>
<li><a name="toc-Overriding-The-Default-Memory-Management-1" href="Overriding-The-Default-Memory-Management.html#Overriding-The-Default-Memory-Management">21.2 Overriding The Default Memory Management</a></li>
<li><a name="toc-A-Note-About-yytext-And-Memory-1" href="A-Note-About-yytext-And-Memory.html#A-Note-About-yytext-And-Memory">21.3 A Note About yytext And Memory</a></li>
</ul></li>
<li><a name="toc-Serialized-Tables-1" href="Serialized-Tables.html#Serialized-Tables">22 Serialized Tables</a>
<ul class="no-bullet">
<li><a name="toc-Creating-Serialized-Tables-1" href="Creating-Serialized-Tables.html#Creating-Serialized-Tables">22.1 Creating Serialized Tables</a></li>
<li><a name="toc-Loading-and-Unloading-Serialized-Tables-1" href="Loading-and-Unloading-Serialized-Tables.html#Loading-and-Unloading-Serialized-Tables">22.2 Loading and Unloading Serialized Tables</a></li>
<li><a name="toc-Tables-File-Format-1" href="Tables-File-Format.html#Tables-File-Format">22.3 Tables File Format</a></li>
</ul></li>
<li><a name="toc-Diagnostics-1" href="Diagnostics.html#Diagnostics">23 Diagnostics</a></li>
<li><a name="toc-Limitations-1" href="Limitations.html#Limitations">24 Limitations</a></li>
<li><a name="toc-Additional-Reading" href="Bibliography.html#Bibliography">25 Additional Reading</a></li>
<li><a name="toc-FAQ-1" href="FAQ.html#FAQ">FAQ</a>
<ul class="no-bullet">
<li><a name="toc-When-was-flex-born_003f-1" href="When-was-flex-born_003f.html#When-was-flex-born_003f">When was flex born?</a></li>
<li><a name="toc-How-do-I-expand-backslash_002descape-sequences-in-C_002dstyle-quoted-strings_003f-1" href="How-do-I-expand-backslash_002descape-sequences-in-C_002dstyle-quoted-strings_003f.html#How-do-I-expand-backslash_002descape-sequences-in-C_002dstyle-quoted-strings_003f">How do I expand backslash-escape sequences in C-style quoted strings?</a></li>
<li><a name="toc-Why-do-flex-scanners-call-fileno-if-it-is-not-ANSI-compatible_003f-1" href="Why-do-flex-scanners-call-fileno-if-it-is-not-ANSI-compatible_003f.html#Why-do-flex-scanners-call-fileno-if-it-is-not-ANSI-compatible_003f">Why do flex scanners call fileno if it is not ANSI compatible?</a></li>
<li><a name="toc-Does-flex-support-recursive-pattern-definitions_003f-1" href="Does-flex-support-recursive-pattern-definitions_003f.html#Does-flex-support-recursive-pattern-definitions_003f">Does flex support recursive pattern definitions?</a></li>
<li><a name="toc-How-do-I-skip-huge-chunks-of-input-_0028tens-of-megabytes_0029-while-using-flex_003f-1" href="How-do-I-skip-huge-chunks-of-input-_0028tens-of-megabytes_0029-while-using-flex_003f.html#How-do-I-skip-huge-chunks-of-input-_0028tens-of-megabytes_0029-while-using-flex_003f">How do I skip huge chunks of input (tens of megabytes) while using flex?</a></li>
<li><a name="toc-Flex-is-not-matching-my-patterns-in-the-same-order-that-I-defined-them_002e-1" href="Flex-is-not-matching-my-patterns-in-the-same-order-that-I-defined-them_002e.html#Flex-is-not-matching-my-patterns-in-the-same-order-that-I-defined-them_002e">Flex is not matching my patterns in the same order that I defined them.</a></li>
<li><a name="toc-My-actions-are-executing-out-of-order-or-sometimes-not-at-all_002e-1" href="My-actions-are-executing-out-of-order-or-sometimes-not-at-all_002e.html#My-actions-are-executing-out-of-order-or-sometimes-not-at-all_002e">My actions are executing out of order or sometimes not at all.</a></li>
<li><a name="toc-How-can-I-have-multiple-input-sources-feed-into-the-same-scanner-at-the-same-time_003f-1" href="How-can-I-have-multiple-input-sources-feed-into-the-same-scanner-at-the-same-time_003f.html#How-can-I-have-multiple-input-sources-feed-into-the-same-scanner-at-the-same-time_003f">How can I have multiple input sources feed into the same scanner at the same time?</a></li>
<li><a name="toc-Can-I-build-nested-parsers-that-work-with-the-same-input-file_003f-1" href="Can-I-build-nested-parsers-that-work-with-the-same-input-file_003f.html#Can-I-build-nested-parsers-that-work-with-the-same-input-file_003f">Can I build nested parsers that work with the same input file?</a></li>
<li><a name="toc-How-can-I-match-text-only-at-the-end-of-a-file_003f-1" href="How-can-I-match-text-only-at-the-end-of-a-file_003f.html#How-can-I-match-text-only-at-the-end-of-a-file_003f">How can I match text only at the end of a file?</a></li>
<li><a name="toc-How-can-I-make-REJECT-cascade-across-start-condition-boundaries_003f-1" href="How-can-I-make-REJECT-cascade-across-start-condition-boundaries_003f.html#How-can-I-make-REJECT-cascade-across-start-condition-boundaries_003f">How can I make REJECT cascade across start condition boundaries?</a></li>
<li><a name="toc-Why-can_0027t-I-use-fast-or-full-tables-with-interactive-mode_003f" href="Why-cant-I-use-fast-or-full-tables-with-interactive-mode_003f.html#Why-cant-I-use-fast-or-full-tables-with-interactive-mode_003f">Why can’t I use fast or full tables with interactive mode?</a></li>
<li><a name="toc-How-much-faster-is-_002dF-or-_002df-than-_002dC_003f-1" href="How-much-faster-is-_002dF-or-_002df-than-_002dC_003f.html#How-much-faster-is-_002dF-or-_002df-than-_002dC_003f">How much faster is -F or -f than -C?</a></li>
<li><a name="toc-If-I-have-a-simple-grammar-can_0027t-I-just-parse-it-with-flex_003f" href="If-I-have-a-simple-grammar-cant-I-just-parse-it-with-flex_003f.html#If-I-have-a-simple-grammar-cant-I-just-parse-it-with-flex_003f">If I have a simple grammar can’t I just parse it with flex?</a></li>
<li><a name="toc-Why-doesn_0027t-yyrestart_0028_0029-set-the-start-state-back-to-INITIAL_003f-1" href="Why-doesn_0027t-yyrestart_0028_0029-set-the-start-state-back-to-INITIAL_003f.html#Why-doesn_0027t-yyrestart_0028_0029-set-the-start-state-back-to-INITIAL_003f">Why doesn’t yyrestart() set the start state back to INITIAL?</a></li>
<li><a name="toc-How-can-I-match-C_002dstyle-comments_003f-1" href="How-can-I-match-C_002dstyle-comments_003f.html#How-can-I-match-C_002dstyle-comments_003f">How can I match C-style comments?</a></li>
<li><a name="toc-The-_0027_002e_0027-isn_0027t-working-the-way-I-expected_002e" href="The-period-isn_0027t-working-the-way-I-expected_002e.html#The-period-isn_0027t-working-the-way-I-expected_002e">The ’.’ isn’t working the way I expected.</a></li>
<li><a name="toc-Can-I-get-the-flex-manual-in-another-format_003f-1" href="Can-I-get-the-flex-manual-in-another-format_003f.html#Can-I-get-the-flex-manual-in-another-format_003f">Can I get the flex manual in another format?</a></li>
<li><a name="toc-Does-there-exist-a-_0022faster_0022-NDFA_002d_003eDFA-algorithm_003f-1" href="Does-there-exist-a-_0022faster_0022-NDFA_002d_003eDFA-algorithm_003f.html#Does-there-exist-a-_0022faster_0022-NDFA_002d_003eDFA-algorithm_003f">Does there exist a "faster" NDFA->DFA algorithm?</a></li>
<li><a name="toc-How-does-flex-compile-the-DFA-so-quickly_003f-1" href="How-does-flex-compile-the-DFA-so-quickly_003f.html#How-does-flex-compile-the-DFA-so-quickly_003f">How does flex compile the DFA so quickly?</a></li>
<li><a name="toc-How-can-I-use-more-than-8192-rules_003f-1" href="How-can-I-use-more-than-8192-rules_003f.html#How-can-I-use-more-than-8192-rules_003f">How can I use more than 8192 rules?</a></li>
<li><a name="toc-How-do-I-abandon-a-file-in-the-middle-of-a-scan-and-switch-to-a-new-file_003f-1" href="How-do-I-abandon-a-file-in-the-middle-of-a-scan-and-switch-to-a-new-file_003f.html#How-do-I-abandon-a-file-in-the-middle-of-a-scan-and-switch-to-a-new-file_003f">How do I abandon a file in the middle of a scan and switch to a new file?</a></li>
<li><a name="toc-How-do-I-execute-code-only-during-initialization-_0028only-before-the-first-scan_0029_003f-1" href="How-do-I-execute-code-only-during-initialization-_0028only-before-the-first-scan_0029_003f.html#How-do-I-execute-code-only-during-initialization-_0028only-before-the-first-scan_0029_003f">How do I execute code only during initialization (only before the first scan)?</a></li>
<li><a name="toc-How-do-I-execute-code-at-termination_003f-1" href="How-do-I-execute-code-at-termination_003f.html#How-do-I-execute-code-at-termination_003f">How do I execute code at termination?</a></li>
<li><a name="toc-Where-else-can-I-find-help_003f-1" href="Where-else-can-I-find-help_003f.html#Where-else-can-I-find-help_003f">Where else can I find help?</a></li>
<li><a name="toc-Can-I-include-comments-in-the-_0022rules_0022-section-of-the-file_003f-1" href="Can-I-include-comments-in-the-_0022rules_0022-section-of-the-file_003f.html#Can-I-include-comments-in-the-_0022rules_0022-section-of-the-file_003f">Can I include comments in the "rules" section of the file?</a></li>
<li><a name="toc-I-get-an-error-about-undefined-yywrap_0028_0029_002e-1" href="I-get-an-error-about-undefined-yywrap_0028_0029_002e.html#I-get-an-error-about-undefined-yywrap_0028_0029_002e">I get an error about undefined yywrap().</a></li>
<li><a name="toc-How-can-I-change-the-matching-pattern-at-run-time_003f-1" href="How-can-I-change-the-matching-pattern-at-run-time_003f.html#How-can-I-change-the-matching-pattern-at-run-time_003f">How can I change the matching pattern at run time?</a></li>
<li><a name="toc-How-can-I-expand-macros-in-the-input_003f-1" href="How-can-I-expand-macros-in-the-input_003f.html#How-can-I-expand-macros-in-the-input_003f">How can I expand macros in the input?</a></li>
<li><a name="toc-How-can-I-build-a-two_002dpass-scanner_003f-1" href="How-can-I-build-a-two_002dpass-scanner_003f.html#How-can-I-build-a-two_002dpass-scanner_003f">How can I build a two-pass scanner?</a></li>
<li><a name="toc-How-do-I-match-any-string-not-matched-in-the-preceding-rules_003f-1" href="How-do-I-match-any-string-not-matched-in-the-preceding-rules_003f.html#How-do-I-match-any-string-not-matched-in-the-preceding-rules_003f">How do I match any string not matched in the preceding rules?</a></li>
<li><a name="toc-I-am-trying-to-port-code-from-AT_0026T-lex-that-uses-yysptr-and-yysbuf_002e-1" href="I-am-trying-to-port-code-from-AT_0026T-lex-that-uses-yysptr-and-yysbuf_002e.html#I-am-trying-to-port-code-from-AT_0026T-lex-that-uses-yysptr-and-yysbuf_002e">I am trying to port code from AT&T lex that uses yysptr and yysbuf.</a></li>
<li><a name="toc-Is-there-a-way-to-make-flex-treat-NULL-like-a-regular-character_003f-1" href="Is-there-a-way-to-make-flex-treat-NULL-like-a-regular-character_003f.html#Is-there-a-way-to-make-flex-treat-NULL-like-a-regular-character_003f">Is there a way to make flex treat NULL like a regular character?</a></li>
<li><a name="toc-Whenever-flex-can-not-match-the-input-it-says-_0022flex-scanner-jammed_0022_002e-1" href="Whenever-flex-can-not-match-the-input-it-says-_0022flex-scanner-jammed_0022_002e.html#Whenever-flex-can-not-match-the-input-it-says-_0022flex-scanner-jammed_0022_002e">Whenever flex can not match the input it says "flex scanner jammed".</a></li>
<li><a name="toc-Why-doesn_0027t-flex-have-non_002dgreedy-operators-like-perl-does_003f-1" href="Why-doesn_0027t-flex-have-non_002dgreedy-operators-like-perl-does_003f.html#Why-doesn_0027t-flex-have-non_002dgreedy-operators-like-perl-does_003f">Why doesn’t flex have non-greedy operators like perl does?</a></li>
<li><a name="toc-Memory-leak-_002d-16386-bytes-allocated-by-malloc_002e-1" href="Memory-leak-_002d-16386-bytes-allocated-by-malloc_002e.html#Memory-leak-_002d-16386-bytes-allocated-by-malloc_002e">Memory leak - 16386 bytes allocated by malloc.</a></li>
<li><a name="toc-How-do-I-track-the-byte-offset-for-lseek_0028_0029_003f-1" href="How-do-I-track-the-byte-offset-for-lseek_0028_0029_003f.html#How-do-I-track-the-byte-offset-for-lseek_0028_0029_003f">How do I track the byte offset for lseek()?</a></li>
<li><a name="toc-How-do-I-use-my-own-I_002fO-classes-in-a-C_002b_002b-scanner_003f-1" href="How-do-I-use-my-own-I_002fO-classes-in-a-C_002b_002b-scanner_003f.html#How-do-I-use-my-own-I_002fO-classes-in-a-C_002b_002b-scanner_003f">How do I use my own I/O classes in a C++ scanner?</a></li>
<li><a name="toc-How-do-I-skip-as-many-chars-as-possible_003f-1" href="How-do-I-skip-as-many-chars-as-possible_003f.html#How-do-I-skip-as-many-chars-as-possible_003f">How do I skip as many chars as possible?</a></li>
<li><a name="toc-deleteme00-1" href="deleteme00.html#deleteme00">deleteme00</a></li>
<li><a name="toc-Are-certain-equivalent-patterns-faster-than-others_003f-1" href="Are-certain-equivalent-patterns-faster-than-others_003f.html#Are-certain-equivalent-patterns-faster-than-others_003f">Are certain equivalent patterns faster than others?</a></li>
<li><a name="toc-Is-backing-up-a-big-deal_003f-1" href="Is-backing-up-a-big-deal_003f.html#Is-backing-up-a-big-deal_003f">Is backing up a big deal?</a></li>
<li><a name="toc-Can-I-fake-multi_002dbyte-character-support_003f-1" href="Can-I-fake-multi_002dbyte-character-support_003f.html#Can-I-fake-multi_002dbyte-character-support_003f">Can I fake multi-byte character support?</a></li>
<li><a name="toc-deleteme01-1" href="deleteme01.html#deleteme01">deleteme01</a></li>
<li><a name="toc-Can-you-discuss-some-flex-internals_003f-1" href="Can-you-discuss-some-flex-internals_003f.html#Can-you-discuss-some-flex-internals_003f">Can you discuss some flex internals?</a></li>
<li><a name="toc-unput_0028_0029-messes-up-yy_005fat_005fbol-1" href="unput_0028_0029-messes-up-yy_005fat_005fbol.html#unput_0028_0029-messes-up-yy_005fat_005fbol">unput() messes up yy_at_bol</a></li>
<li><a name="toc-The-_007c-operator-is-not-doing-what-I-want-1" href="The-_007c-operator-is-not-doing-what-I-want.html#The-_007c-operator-is-not-doing-what-I-want">The | operator is not doing what I want</a></li>
<li><a name="toc-Why-can_0027t-flex-understand-this-variable-trailing-context-pattern_003f-1" href="Why-can_0027t-flex-understand-this-variable-trailing-context-pattern_003f.html#Why-can_0027t-flex-understand-this-variable-trailing-context-pattern_003f">Why can’t flex understand this variable trailing context pattern?</a></li>
<li><a name="toc-The-_005e-operator-isn_0027t-working-1" href="The-_005e-operator-isn_0027t-working.html#The-_005e-operator-isn_0027t-working">The ^ operator isn’t working</a></li>
<li><a name="toc-Trailing-context-is-getting-confused-with-trailing-optional-patterns-1" href="Trailing-context-is-getting-confused-with-trailing-optional-patterns.html#Trailing-context-is-getting-confused-with-trailing-optional-patterns">Trailing context is getting confused with trailing optional patterns</a></li>
<li><a name="toc-Is-flex-GNU-or-not_003f-1" href="Is-flex-GNU-or-not_003f.html#Is-flex-GNU-or-not_003f">Is flex GNU or not?</a></li>
<li><a name="toc-ERASEME53-1" href="ERASEME53.html#ERASEME53">ERASEME53</a></li>
<li><a name="toc-I-need-to-scan-if_002dthen_002delse-blocks-and-while-loops-1" href="I-need-to-scan-if_002dthen_002delse-blocks-and-while-loops.html#I-need-to-scan-if_002dthen_002delse-blocks-and-while-loops">I need to scan if-then-else blocks and while loops</a></li>
<li><a name="toc-ERASEME55-1" href="ERASEME55.html#ERASEME55">ERASEME55</a></li>
<li><a name="toc-ERASEME56-1" href="ERASEME56.html#ERASEME56">ERASEME56</a></li>
<li><a name="toc-ERASEME57-1" href="ERASEME57.html#ERASEME57">ERASEME57</a></li>
<li><a name="toc-Is-there-a-repository-for-flex-scanners_003f-1" href="Is-there-a-repository-for-flex-scanners_003f.html#Is-there-a-repository-for-flex-scanners_003f">Is there a repository for flex scanners?</a></li>
<li><a name="toc-How-can-I-conditionally-compile-or-preprocess-my-flex-input-file_003f-1" href="How-can-I-conditionally-compile-or-preprocess-my-flex-input-file_003f.html#How-can-I-conditionally-compile-or-preprocess-my-flex-input-file_003f">How can I conditionally compile or preprocess my flex input file?</a></li>
<li><a name="toc-Where-can-I-find-grammars-for-lex-and-yacc_003f-1" href="Where-can-I-find-grammars-for-lex-and-yacc_003f.html#Where-can-I-find-grammars-for-lex-and-yacc_003f">Where can I find grammars for lex and yacc?</a></li>
<li><a name="toc-I-get-an-end_002dof_002dbuffer-message-for-each-character-scanned_002e-1" href="I-get-an-end_002dof_002dbuffer-message-for-each-character-scanned_002e.html#I-get-an-end_002dof_002dbuffer-message-for-each-character-scanned_002e">I get an end-of-buffer message for each character scanned.</a></li>
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<li><a name="toc-unnamed_002dfaq_002d101-1" href="unnamed_002dfaq_002d101.html#unnamed_002dfaq_002d101">unnamed-faq-101</a></li>
<li><a name="toc-What-is-the-difference-between-YYLEX_005fPARAM-and-YY_005fDECL_003f-1" href="What-is-the-difference-between-YYLEX_005fPARAM-and-YY_005fDECL_003f.html#What-is-the-difference-between-YYLEX_005fPARAM-and-YY_005fDECL_003f">What is the difference between YYLEX_PARAM and YY_DECL?</a></li>
<li><a name="toc-Why-do-I-get-_0022conflicting-types-for-yylex_0022-error_003f-1" href="Why-do-I-get-_0022conflicting-types-for-yylex_0022-error_003f.html#Why-do-I-get-_0022conflicting-types-for-yylex_0022-error_003f">Why do I get "conflicting types for yylex" error?</a></li>
<li><a name="toc-How-do-I-access-the-values-set-in-a-Flex-action-from-within-a-Bison-action_003f-1" href="How-do-I-access-the-values-set-in-a-Flex-action-from-within-a-Bison-action_003f.html#How-do-I-access-the-values-set-in-a-Flex-action-from-within-a-Bison-action_003f">How do I access the values set in a Flex action from within a Bison action?</a></li>
</ul></li>
<li><a name="toc-Appendices-1" href="Appendices.html#Appendices">Appendix A Appendices</a>
<ul class="no-bullet">
<li><a name="toc-Makefiles-and-Flex-1" href="Makefiles-and-Flex.html#Makefiles-and-Flex">A.1 Makefiles and Flex</a></li>
<li><a name="toc-C-Scanners-with-Bison-Parsers" href="Bison-Bridge.html#Bison-Bridge">A.2 C Scanners with Bison Parsers</a></li>
<li><a name="toc-M4-Dependency-1" href="M4-Dependency.html#M4-Dependency">A.3 M4 Dependency</a></li>
<li><a name="toc-Common-Patterns-1" href="Common-Patterns.html#Common-Patterns">A.4 Common Patterns</a>
<ul class="no-bullet">
<li><a name="toc-Numbers-1" href="Numbers.html#Numbers">A.4.1 Numbers</a></li>
<li><a name="toc-Identifiers-1" href="Identifiers.html#Identifiers">A.4.2 Identifiers</a></li>
<li><a name="toc-Quoted-Constructs-1" href="Quoted-Constructs.html#Quoted-Constructs">A.4.3 Quoted Constructs</a></li>
<li><a name="toc-Addresses-1" href="Addresses.html#Addresses">A.4.4 Addresses</a></li>
</ul></li>
</ul></li>
<li><a name="toc-Indices-1" href="Indices.html#Indices">Indices</a>
<ul class="no-bullet">
<li><a name="toc-Concept-Index-1" href="Concept-Index.html#Concept-Index">Concept Index</a></li>
<li><a name="toc-Index-of-Functions-and-Macros-1" href="Index-of-Functions-and-Macros.html#Index-of-Functions-and-Macros">Index of Functions and Macros</a></li>
<li><a name="toc-Index-of-Variables-1" href="Index-of-Variables.html#Index-of-Variables">Index of Variables</a></li>
<li><a name="toc-Index-of-Data-Types-1" href="Index-of-Data-Types.html#Index-of-Data-Types">Index of Data Types</a></li>
<li><a name="toc-Index-of-Hooks-1" href="Index-of-Hooks.html#Index-of-Hooks">Index of Hooks</a></li>
<li><a name="toc-Index-of-Scanner-Options-1" href="Index-of-Scanner-Options.html#Index-of-Scanner-Options">Index of Scanner Options</a></li>
</ul></li>
</ul>
</div>
<a name="Top"></a>
<div class="header">
<p>
Next: <a href="Copyright.html#Copyright" accesskey="n" rel="next">Copyright</a>, Previous: <a href="../dir/index.html" accesskey="p" rel="previous">(dir)</a>, Up: <a href="../dir/index.html" accesskey="u" rel="up">(dir)</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="flex"></a>
<h1 class="top">flex</h1>
<p>This manual describes <code>flex</code>, a tool for generating programs that
perform pattern-matching on text. The manual includes both tutorial and
reference sections.
</p>
<p>This edition of <cite>The flex Manual</cite> documents <code>flex</code> version
2.5.35. It was last updated on 10 September 2007.
</p>
<p>This manual was written by Vern Paxson, Will Estes and John Millaway.
</p>
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<tr><td align="left" valign="top">• <a href="Copyright.html#Copyright" accesskey="1">Copyright</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Introduction.html#Introduction" accesskey="3">Introduction</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
<tr><td align="left" valign="top">• <a href="Format.html#Format" accesskey="5">Format</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Patterns.html#Patterns" accesskey="6">Patterns</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Matching.html#Matching" accesskey="7">Matching</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Generated-Scanner.html#Generated-Scanner" accesskey="9">Generated Scanner</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Start-Conditions.html#Start-Conditions">Start Conditions</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Multiple-Input-Buffers.html#Multiple-Input-Buffers">Multiple Input Buffers</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="EOF.html#EOF">EOF</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Misc-Macros.html#Misc-Macros">Misc Macros</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="User-Values.html#User-Values">User Values</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Yacc.html#Yacc">Yacc</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
<tr><td align="left" valign="top">• <a href="Performance.html#Performance">Performance</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Cxx.html#Cxx">Cxx</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Reentrant.html#Reentrant">Reentrant</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Lex-and-Posix.html#Lex-and-Posix">Lex and Posix</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Memory-Management.html#Memory-Management">Memory Management</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Serialized-Tables.html#Serialized-Tables">Serialized Tables</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Limitations.html#Limitations">Limitations</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Bibliography.html#Bibliography">Bibliography</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="FAQ.html#FAQ">FAQ</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Appendices.html#Appendices">Appendices</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Indices.html#Indices">Indices</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><th colspan="3" align="left" valign="top"><pre class="menu-comment">
</pre></th></tr><tr><th colspan="3" align="left" valign="top"><pre class="menu-comment"> — The Detailed Node Listing —
Format of the Input File
</pre></th></tr><tr><td align="left" valign="top">• <a href="Definitions-Section.html#Definitions-Section">Definitions Section</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Rules-Section.html#Rules-Section">Rules Section</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="User-Code-Section.html#User-Code-Section">User Code Section</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Comments-in-the-Input.html#Comments-in-the-Input">Comments in the Input</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><th colspan="3" align="left" valign="top"><pre class="menu-comment">
Scanner Options
</pre></th></tr><tr><td align="left" valign="top">• <a href="Options-for-Specifying-Filenames.html#Options-for-Specifying-Filenames">Options for Specifying Filenames</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Options-Affecting-Scanner-Behavior.html#Options-Affecting-Scanner-Behavior">Options Affecting Scanner Behavior</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Code_002dLevel-And-API-Options.html#Code_002dLevel-And-API-Options">Code-Level And API Options</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Options-for-Scanner-Speed-and-Size.html#Options-for-Scanner-Speed-and-Size">Options for Scanner Speed and Size</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Debugging-Options.html#Debugging-Options">Debugging Options</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Miscellaneous-Options.html#Miscellaneous-Options">Miscellaneous Options</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><th colspan="3" align="left" valign="top"><pre class="menu-comment">
Reentrant C Scanners
</pre></th></tr><tr><td align="left" valign="top">• <a href="Reentrant-Uses.html#Reentrant-Uses">Reentrant Uses</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Reentrant-Overview.html#Reentrant-Overview">Reentrant Overview</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Reentrant-Example.html#Reentrant-Example">Reentrant Example</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Reentrant-Detail.html#Reentrant-Detail">Reentrant Detail</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Reentrant-Functions.html#Reentrant-Functions">Reentrant Functions</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><th colspan="3" align="left" valign="top"><pre class="menu-comment">
The Reentrant API in Detail
</pre></th></tr><tr><td align="left" valign="top">• <a href="Specify-Reentrant.html#Specify-Reentrant">Specify Reentrant</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Extra-Reentrant-Argument.html#Extra-Reentrant-Argument">Extra Reentrant Argument</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Global-Replacement.html#Global-Replacement">Global Replacement</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Init-and-Destroy-Functions.html#Init-and-Destroy-Functions">Init and Destroy Functions</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Accessor-Methods.html#Accessor-Methods">Accessor Methods</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Extra-Data.html#Extra-Data">Extra Data</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="About-yyscan_005ft.html#About-yyscan_005ft">About yyscan_t</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><th colspan="3" align="left" valign="top"><pre class="menu-comment">
Memory Management
</pre></th></tr><tr><td align="left" valign="top">• <a href="The-Default-Memory-Management.html#The-Default-Memory-Management">The Default Memory Management</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Overriding-The-Default-Memory-Management.html#Overriding-The-Default-Memory-Management">Overriding The Default Memory Management</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="A-Note-About-yytext-And-Memory.html#A-Note-About-yytext-And-Memory">A Note About yytext And Memory</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><th colspan="3" align="left" valign="top"><pre class="menu-comment">
Serialized Tables
</pre></th></tr><tr><td align="left" valign="top">• <a href="Creating-Serialized-Tables.html#Creating-Serialized-Tables">Creating Serialized Tables</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Loading-and-Unloading-Serialized-Tables.html#Loading-and-Unloading-Serialized-Tables">Loading and Unloading Serialized Tables</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Tables-File-Format.html#Tables-File-Format">Tables File Format</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><th colspan="3" align="left" valign="top"><pre class="menu-comment">
FAQ
</pre></th></tr><tr><td align="left" valign="top">• <a href="When-was-flex-born_003f.html#When-was-flex-born_003f">When was flex born?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-do-I-expand-backslash_002descape-sequences-in-C_002dstyle-quoted-strings_003f.html#How-do-I-expand-backslash_002descape-sequences-in-C_002dstyle-quoted-strings_003f">How do I expand backslash-escape sequences in C-style quoted strings?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Why-do-flex-scanners-call-fileno-if-it-is-not-ANSI-compatible_003f.html#Why-do-flex-scanners-call-fileno-if-it-is-not-ANSI-compatible_003f">Why do flex scanners call fileno if it is not ANSI compatible?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Does-flex-support-recursive-pattern-definitions_003f.html#Does-flex-support-recursive-pattern-definitions_003f">Does flex support recursive pattern definitions?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-do-I-skip-huge-chunks-of-input-_0028tens-of-megabytes_0029-while-using-flex_003f.html#How-do-I-skip-huge-chunks-of-input-_0028tens-of-megabytes_0029-while-using-flex_003f">How do I skip huge chunks of input (tens of megabytes) while using flex?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Flex-is-not-matching-my-patterns-in-the-same-order-that-I-defined-them_002e.html#Flex-is-not-matching-my-patterns-in-the-same-order-that-I-defined-them_002e">Flex is not matching my patterns in the same order that I defined them.</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="My-actions-are-executing-out-of-order-or-sometimes-not-at-all_002e.html#My-actions-are-executing-out-of-order-or-sometimes-not-at-all_002e">My actions are executing out of order or sometimes not at all.</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-can-I-have-multiple-input-sources-feed-into-the-same-scanner-at-the-same-time_003f.html#How-can-I-have-multiple-input-sources-feed-into-the-same-scanner-at-the-same-time_003f">How can I have multiple input sources feed into the same scanner at the same time?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Can-I-build-nested-parsers-that-work-with-the-same-input-file_003f.html#Can-I-build-nested-parsers-that-work-with-the-same-input-file_003f">Can I build nested parsers that work with the same input file?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-can-I-match-text-only-at-the-end-of-a-file_003f.html#How-can-I-match-text-only-at-the-end-of-a-file_003f">How can I match text only at the end of a file?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-can-I-make-REJECT-cascade-across-start-condition-boundaries_003f.html#How-can-I-make-REJECT-cascade-across-start-condition-boundaries_003f">How can I make REJECT cascade across start condition boundaries?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Why-cant-I-use-fast-or-full-tables-with-interactive-mode_003f.html#Why-cant-I-use-fast-or-full-tables-with-interactive-mode_003f">Why cant I use fast or full tables with interactive mode?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-much-faster-is-_002dF-or-_002df-than-_002dC_003f.html#How-much-faster-is-_002dF-or-_002df-than-_002dC_003f">How much faster is -F or -f than -C?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="If-I-have-a-simple-grammar-cant-I-just-parse-it-with-flex_003f.html#If-I-have-a-simple-grammar-cant-I-just-parse-it-with-flex_003f">If I have a simple grammar cant I just parse it with flex?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Why-doesn_0027t-yyrestart_0028_0029-set-the-start-state-back-to-INITIAL_003f.html#Why-doesn_0027t-yyrestart_0028_0029-set-the-start-state-back-to-INITIAL_003f">Why doesn't yyrestart() set the start state back to INITIAL?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-can-I-match-C_002dstyle-comments_003f.html#How-can-I-match-C_002dstyle-comments_003f">How can I match C-style comments?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="The-period-isn_0027t-working-the-way-I-expected_002e.html#The-period-isn_0027t-working-the-way-I-expected_002e">The period isn't working the way I expected.</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Can-I-get-the-flex-manual-in-another-format_003f.html#Can-I-get-the-flex-manual-in-another-format_003f">Can I get the flex manual in another format?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Does-there-exist-a-_0022faster_0022-NDFA_002d_003eDFA-algorithm_003f.html#Does-there-exist-a-_0022faster_0022-NDFA_002d_003eDFA-algorithm_003f">Does there exist a "faster" NDFA->DFA algorithm?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-does-flex-compile-the-DFA-so-quickly_003f.html#How-does-flex-compile-the-DFA-so-quickly_003f">How does flex compile the DFA so quickly?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-can-I-use-more-than-8192-rules_003f.html#How-can-I-use-more-than-8192-rules_003f">How can I use more than 8192 rules?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-do-I-abandon-a-file-in-the-middle-of-a-scan-and-switch-to-a-new-file_003f.html#How-do-I-abandon-a-file-in-the-middle-of-a-scan-and-switch-to-a-new-file_003f">How do I abandon a file in the middle of a scan and switch to a new file?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-do-I-execute-code-only-during-initialization-_0028only-before-the-first-scan_0029_003f.html#How-do-I-execute-code-only-during-initialization-_0028only-before-the-first-scan_0029_003f">How do I execute code only during initialization (only before the first scan)?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-do-I-execute-code-at-termination_003f.html#How-do-I-execute-code-at-termination_003f">How do I execute code at termination?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Where-else-can-I-find-help_003f.html#Where-else-can-I-find-help_003f">Where else can I find help?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Can-I-include-comments-in-the-_0022rules_0022-section-of-the-file_003f.html#Can-I-include-comments-in-the-_0022rules_0022-section-of-the-file_003f">Can I include comments in the "rules" section of the file?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="I-get-an-error-about-undefined-yywrap_0028_0029_002e.html#I-get-an-error-about-undefined-yywrap_0028_0029_002e">I get an error about undefined yywrap().</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-can-I-change-the-matching-pattern-at-run-time_003f.html#How-can-I-change-the-matching-pattern-at-run-time_003f">How can I change the matching pattern at run time?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-can-I-expand-macros-in-the-input_003f.html#How-can-I-expand-macros-in-the-input_003f">How can I expand macros in the input?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-can-I-build-a-two_002dpass-scanner_003f.html#How-can-I-build-a-two_002dpass-scanner_003f">How can I build a two-pass scanner?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-do-I-match-any-string-not-matched-in-the-preceding-rules_003f.html#How-do-I-match-any-string-not-matched-in-the-preceding-rules_003f">How do I match any string not matched in the preceding rules?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="I-am-trying-to-port-code-from-AT_0026T-lex-that-uses-yysptr-and-yysbuf_002e.html#I-am-trying-to-port-code-from-AT_0026T-lex-that-uses-yysptr-and-yysbuf_002e">I am trying to port code from AT&T lex that uses yysptr and yysbuf.</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Is-there-a-way-to-make-flex-treat-NULL-like-a-regular-character_003f.html#Is-there-a-way-to-make-flex-treat-NULL-like-a-regular-character_003f">Is there a way to make flex treat NULL like a regular character?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Whenever-flex-can-not-match-the-input-it-says-_0022flex-scanner-jammed_0022_002e.html#Whenever-flex-can-not-match-the-input-it-says-_0022flex-scanner-jammed_0022_002e">Whenever flex can not match the input it says "flex scanner jammed".</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Why-doesn_0027t-flex-have-non_002dgreedy-operators-like-perl-does_003f.html#Why-doesn_0027t-flex-have-non_002dgreedy-operators-like-perl-does_003f">Why doesn't flex have non-greedy operators like perl does?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Memory-leak-_002d-16386-bytes-allocated-by-malloc_002e.html#Memory-leak-_002d-16386-bytes-allocated-by-malloc_002e">Memory leak - 16386 bytes allocated by malloc.</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-do-I-track-the-byte-offset-for-lseek_0028_0029_003f.html#How-do-I-track-the-byte-offset-for-lseek_0028_0029_003f">How do I track the byte offset for lseek()?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-do-I-use-my-own-I_002fO-classes-in-a-C_002b_002b-scanner_003f.html#How-do-I-use-my-own-I_002fO-classes-in-a-C_002b_002b-scanner_003f">How do I use my own I/O classes in a C++ scanner?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-do-I-skip-as-many-chars-as-possible_003f.html#How-do-I-skip-as-many-chars-as-possible_003f">How do I skip as many chars as possible?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="deleteme00.html#deleteme00">deleteme00</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Are-certain-equivalent-patterns-faster-than-others_003f.html#Are-certain-equivalent-patterns-faster-than-others_003f">Are certain equivalent patterns faster than others?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Is-backing-up-a-big-deal_003f.html#Is-backing-up-a-big-deal_003f">Is backing up a big deal?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Can-I-fake-multi_002dbyte-character-support_003f.html#Can-I-fake-multi_002dbyte-character-support_003f">Can I fake multi-byte character support?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="deleteme01.html#deleteme01">deleteme01</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Can-you-discuss-some-flex-internals_003f.html#Can-you-discuss-some-flex-internals_003f">Can you discuss some flex internals?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="unput_0028_0029-messes-up-yy_005fat_005fbol.html#unput_0028_0029-messes-up-yy_005fat_005fbol">unput() messes up yy_at_bol</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="The-_007c-operator-is-not-doing-what-I-want.html#The-_007c-operator-is-not-doing-what-I-want">The | operator is not doing what I want</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Why-can_0027t-flex-understand-this-variable-trailing-context-pattern_003f.html#Why-can_0027t-flex-understand-this-variable-trailing-context-pattern_003f">Why can't flex understand this variable trailing context pattern?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="The-_005e-operator-isn_0027t-working.html#The-_005e-operator-isn_0027t-working">The ^ operator isn't working</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Trailing-context-is-getting-confused-with-trailing-optional-patterns.html#Trailing-context-is-getting-confused-with-trailing-optional-patterns">Trailing context is getting confused with trailing optional patterns</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Is-flex-GNU-or-not_003f.html#Is-flex-GNU-or-not_003f">Is flex GNU or not?</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="ERASEME53.html#ERASEME53">ERASEME53</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="I-need-to-scan-if_002dthen_002delse-blocks-and-while-loops.html#I-need-to-scan-if_002dthen_002delse-blocks-and-while-loops">I need to scan if-then-else blocks and while loops</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
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<tr><td align="left" valign="top">• <a href="What-is-the-difference-between-YYLEX_005fPARAM-and-YY_005fDECL_003f.html#What-is-the-difference-between-YYLEX_005fPARAM-and-YY_005fDECL_003f">What is the difference between YYLEX_PARAM and YY_DECL?</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Why-do-I-get-_0022conflicting-types-for-yylex_0022-error_003f.html#Why-do-I-get-_0022conflicting-types-for-yylex_0022-error_003f">Why do I get "conflicting types for yylex" error?</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="How-do-I-access-the-values-set-in-a-Flex-action-from-within-a-Bison-action_003f.html#How-do-I-access-the-values-set-in-a-Flex-action-from-within-a-Bison-action_003f">How do I access the values set in a Flex action from within a Bison action?</a>:</td><td> </td><td align="left" valign="top">
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<tr><th colspan="3" align="left" valign="top"><pre class="menu-comment">
Appendices
</pre></th></tr><tr><td align="left" valign="top">• <a href="Makefiles-and-Flex.html#Makefiles-and-Flex">Makefiles and Flex</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Bison-Bridge.html#Bison-Bridge">Bison Bridge</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="M4-Dependency.html#M4-Dependency">M4 Dependency</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Common-Patterns.html#Common-Patterns">Common Patterns</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><th colspan="3" align="left" valign="top"><pre class="menu-comment">
Indices
</pre></th></tr><tr><td align="left" valign="top">• <a href="Concept-Index.html#Concept-Index">Concept Index</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Index-of-Functions-and-Macros.html#Index-of-Functions-and-Macros">Index of Functions and Macros</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Index-of-Variables.html#Index-of-Variables">Index of Variables</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Index-of-Data-Types.html#Index-of-Data-Types">Index of Data Types</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Index-of-Hooks.html#Index-of-Hooks">Index of Hooks</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Index-of-Scanner-Options.html#Index-of-Scanner-Options">Index of Scanner Options</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><th colspan="3" align="left" valign="top"><pre class="menu-comment">
</pre></th></tr></table>
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