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copied!<p>You may need to tell Perl that your source file contains utf8 characters. Try:</p> <pre><code>#!/usr/bin/perl use utf8; # **** Add this line $str = 'mısır'; $str =~ m/m[ıi]s[ıi]r/ && print "match double undotted ı\n"; </code></pre> <p>Which doesn't help you with PHP but there may be a similar directive in PHP. Otherwise, try using some form of escape-sequence to avoid putting the literal character in your source-code. I know nothing about PHP so I can't help with that.</p> <p><strong><em>Edit</em></strong><br> I'm reading that PHP has no Unicode support. Therefore, the unicode input you pass it is likely treated as the string of bytes that the unicode was encoded as.</p> <p>If you can be assured that your input is coming in as utf-8 then you can match for the utf-8 sequence for <code>ı</code> which is <code>\xc4 \xb1</code> as in:</p> <pre><code>$str = 'mısır'; # Make sure this source-file is encoded as utf-8 or this match will fail echo (preg_match('!m(i|\xc4\xb1)s(i|\xc4\xb1)r!', $str)) ? "ok\n" : "fail\n"; </code></pre> <p>Does that work?</p> <p><strong>Edit again:</strong><br> I can explain why your first three tests pass. Let's pretend that in your encoding, <code>ı</code> is encoded as <code>ABCDE</code>. then PHP sees the following:</p> <pre><code>echo 'match single normal i: '; $str = 'mi'; echo (preg_match('!m[ABCDEi]!', $str)) ? "ok\n" : "fail\n"; echo 'match single undotted ABCDE: '; $str = 'mABCDE'; echo (preg_match('!m[ABCDEi]!', $str)) ? "ok\n" : "fail\n"; echo 'match double normal i: '; $str = 'misir'; echo (preg_match('!m[ABCDEi]s[ABCDEi]r!', $str)) ? "ok\n" : "fail\n"; echo 'match double undotted ABCDE: '; $str = 'mABCDEsABCDEr'; echo (preg_match('!m[ABCDEi]s[ABCDEi]r!', $str)) ? "ok\n" : "fail\n"; </code></pre> <p>which makes it obvious why the first three tests pass and the last one fails. If you use a start/end anchor <code>^...$</code> I think you'll find that only the first test passes.</p>

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