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POPerl regex choking on multiple instances of character sets
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  1. POPerl regex choking on multiple instances of character sets
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    copied!<p>I started out with some crazy failures using preg_replace in php and boiled it down to the problem case of having more than one character class using turkish dotted "i" and undotted "ı" together. Here is a simple test case in php:</p> <pre><code>&lt;?php echo 'match single normal i: '; $str = 'mi'; echo (preg_match('!m[ıi]!', $str)) ? "ok\n" : "fail\n"; echo 'match single undotted ı: '; $str = 'mı'; echo (preg_match('!m[ıi]!', $str)) ? "ok\n" : "fail\n"; echo 'match double normal i: '; $str = 'misir'; echo (preg_match('!m[ıi]s[ıi]r!', $str)) ? "ok\n" : "fail\n"; echo 'match double undotted ı: '; $str = 'mısır'; echo (preg_match('!m[ıi]s[ıi]r!', $str)) ? "ok\n" : "fail\n"; ?&gt; </code></pre> <p>And the same test case again in perl:</p> <pre><code>#!/usr/bin/perl $str = 'mi'; $str =~ m/m[ıi]/ &amp;&amp; print "match single normal i\n"; $str = 'mı'; $str =~ m/m[ıi]/ &amp;&amp; print "match single undotted ı\n"; $str = 'misir'; $str =~ m/m[ıi]s[ıi]r/ &amp;&amp; print "match double normal i\n"; $str = 'mısır'; $str =~ m/m[ıi]s[ıi]r/ &amp;&amp; print "match double undotted ı\n"; </code></pre> <p>The first three tests work fine. The last one does not match.</p> <p>Why does this work fine as a character class once but not the second time in the same expression? How do I write an expression to match for a word like this that needs to match no matter what combinations of letters it is written with?</p> <p><strong>Edit:</strong> Background on <a href="http://www.i18nguy.com/unicode/turkish-i18n.html#problem" rel="nofollow">the language problem</a> I'm trying to program for.</p> <p><strong>Edit 2:</strong> Adding a <code>use utf8;</code> directive does fix the perl version. Since my original problem was with a php program and I only switched to perl to see if it was a bug in php, that doesn't help me a whole lot. <em>Does anybody know the directive to make PHP not choke on this?</em></p>
 

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