Why does this preg_match not return 1?

Posted by JavaRocky on Stack Overflow See other posts from Stack Overflow or by JavaRocky
Published on 2010-05-17T22:21:54Z Indexed on 2010/05/17 22:30 UTC
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I've been looking at this code and it's supposed to match my $input string and in $matches[0] store 'testing'

$input = ':testing';
$r = preg_match('/^(?<=\:).+/',$input,$matches);

What's wrong with it?

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