Correction: it looks like this 
(?^x:((?^:(?<identifier> \w+

[download]
</code>

(I also forgot x :)

Also, you may find this useful: http://stackoverflow.com/questions/4231382/regular-expression-pattern-not-matching-anywhere-in-string/4234491#4234491

In reply to Re^2: Storing part of a regex in a variable by Anonymous Monk
in thread Storing part of a regex in a variable by jonneve

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