This file is indexed.

/usr/share/doc/flex-doc/html/Addresses.html is in flex-doc 2.5.35-10.1ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- 
The flex manual is placed under the same licensing conditions as the
rest of flex:

Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 The Flex
Project.

Copyright (C) 1990, 1997 The Regents of the University of California.
All rights reserved.

This code is derived from software contributed to Berkeley by
Vern Paxson.

The United States Government has rights in this work pursuant
to contract no. DE-AC03-76SF00098 between the United States
Department of Energy and the University of California.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.

THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. -->
<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ -->
<head>
<title>Lexical Analysis With Flex: Addresses</title>

<meta name="description" content="Lexical Analysis With Flex: Addresses">
<meta name="keywords" content="Lexical Analysis With Flex: Addresses">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link href="index.html#Top" rel="start" title="Top">
<link href="Indices.html#Indices" rel="index" title="Indices">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="Common-Patterns.html#Common-Patterns" rel="up" title="Common Patterns">
<link href="Indices.html#Indices" rel="next" title="Indices">
<link href="Quoted-Constructs.html#Quoted-Constructs" rel="previous" title="Quoted Constructs">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.indentedblock {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
div.smalllisp {margin-left: 3.2em}
kbd {font-style:oblique}
pre.display {font-family: inherit}
pre.format {font-family: inherit}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
pre.smalldisplay {font-family: inherit; font-size: smaller}
pre.smallexample {font-size: smaller}
pre.smallformat {font-family: inherit; font-size: smaller}
pre.smalllisp {font-size: smaller}
span.nocodebreak {white-space:nowrap}
span.nolinebreak {white-space:nowrap}
span.roman {font-family:serif; font-weight:normal}
span.sansserif {font-family:sans-serif; font-weight:normal}
ul.no-bullet {list-style: none}
-->
</style>


</head>

<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
<a name="Addresses"></a>
<div class="header">
<p>
Previous: <a href="Quoted-Constructs.html#Quoted-Constructs" accesskey="p" rel="previous">Quoted Constructs</a>, Up: <a href="Common-Patterns.html#Common-Patterns" accesskey="u" rel="up">Common Patterns</a> &nbsp; [<a href="index.html#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="Addresses-1"></a>
<h4 class="subsection">A.4.4 Addresses</h4>

<dl compact="compact">
<dt>IPv4 Address</dt>
<dd><p><code>(([[:digit:]]{1,3}&quot;.&quot;){3}([[:digit:]]{1,3}))</code>
</p>
</dd>
<dt>IPv6 Address</dt>
<dd><pre class="verbatim">hex4         ([[:xdigit:]]{1,4})
hexseq       ({hex4}(:{hex4}*))
hexpart      ({hexseq}|({hexseq}::({hexseq}?))|::{hexseq})
IPv6address  ({hexpart}(&quot;:&quot;{IPv4address})?)
</pre>
<p>See RFC2373 for details.
</p>
</dd>
<dt>URI</dt>
<dd><p><code>(([^:/?#]+):)?(&quot;//&quot;([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?</code>
</p>
<p>This pattern is nearly useless, since it allows just about any character to
appear in a URI, including spaces and control characters.  See RFC2396 for
details.
</p>
</dd>
</dl>





</body>
</html>