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    What the devil language is that in?? I see a /D flag, and you’ve quoted it with single quotes yet also used slashes to delimit the pattern? It’s not Perl, and it can’t be PCRE. Is it therefore PHP? I believe those are the only three that allow recursion like (?1). Commented Nov 7, 2010 at 20:32
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    It's in PHP, which uses PCRE. The slashes are used only to delimit special characters like parentheses, square brackets, and of course slashes and single quotes. The /D flag, if you didn't know, is to prevent a newline being added to the end of the string, which would be allowed otherwise. Commented Feb 19, 2011 at 18:24