Regular expression examples: Difference between revisions

Revision as of 20:29, 22 September 2010

Revision as of 21:44, 11 October 2010

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== Examples ==

Unless otherwise indicated, the following examples conform to the [[Perl]] programming language, release 5.8.8, January 31, 2006. This means, that other implementations may lack support for some parts of the syntax, as shown here (e.g. basic vs. extended regex, \( \) vs. (), or lack of \d instead of [[POSIX]] [:digit:]).

The syntax and conventions used in these examples coincide with that of other programming environments as well (e.g., see Java in a Nutshell — Page 213, Python Scripting for Computational Science — Page 320, Programming PHP — Page 106 ).

<table class="wikitable">

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print "We matched '$1' and '$2'\n";

}

</pre>'''Output:'''<pre>

We matched 'Hel' and 'o W';

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<tr>

<td>?</td>

<td>Modifies the *, +, or {M,N}'d regexpregex that comes before

to match as few times as possible.</td>

<td align="left">

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if ($string1 =~ m/llo\b/) {

print "There is a word that ends with 'llo'\n";

} else {

print "There are no words that end with 'llo'\n";

}

</pre></td>

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print "$1 is the first number in '$string1'\n";

}

</pre>'''Output:'''<pre>

99 is the first number in '99 bottles of beer on the wall.'

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<tr>

<td>\z</td>

<td>Matches the end of a string (but not an internal line).<br/> see Perl Best Practices&nbsp;— Page 240</td>

<td align="left">

<pre>