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<h1>regexp</h1>
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<p>This function returns the substring of the input character string <i>instr</i>, which is the content of n-th group matching to the <i>expression</i>. In input string <i>instr</i> may be of any
character string type. The type of the character string returned is the root type of <i>instr</i>. The expression is a character pattern. The number of the group to be returned is specified by <i>groupno</i>,
which shall be a non-negative integer. Group numbers are assigned by the order of occurrences of the opening parenthesis of a group and counted starting from 0 by step 1. If no substring fulfilling
all conditions (i.e. pattern and group number) is found within the input string, an empty string is returned.
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<p>Related keyword:</p>
<ul>
<li><b><font face="Courier New" size="4" color="#003258"><a href="integer.html">integer</a></font></b></li>
<li><b><a href="charstring.html"><font face="Courier New" size="4" color="#003258">charstring</font></a></b></li>
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<h3 align="center"><font face="Courier New" color="#003258" size="5"><b>regexp</b></font><font face="Courier New" color="#003258" size="5"><b>(</b></font><i>any_character_string_type
instr, </i><b>charstring</b> <i>expression, </i><b>integer</b><i> groupno</i><font face="Courier New" color="#003258" size="5"><b>) return character_string_type</b></font></h3>
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<p>Example 1:</p>
<p><font face="Courier New"> var charstring mypattern2 := ""<br>
var charstring myinput :=" date: 2001-10-20; msgno: 17; exp "<br>
var charstring mypattern := "[ \\t]#(,)date: [\\d\\-]#(,);[ \\t]#(,)msgno: (\\d#(1,3));[ \\t]#(,)(exp[ \\t]#(,))#(0,1)"<br>
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<p> // Then the expression<br>
var charstring mystring := regexp(myinput, mypattern, 0)<br>
//will return the value '17'.
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