in reply to Re: Re: Useful Uses of regex code expressions?
in thread Useful Uses of regex code expressions?

Regarding 1: That most certainly is an undocumented feature. According go perlre: 

(?(condition)yes-pattern|no-pattern)
(?(condition)yes-pattern)

Conditional expression. (condition) should be either an integer in par
+entheses (which is valid if the corresponding pair of parentheses mat
+ched), or look-ahead/look-behind/evaluate zero-width assertion.

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Update: I saw, and read that phrase; however, my brain hates me and skipped processing it correctly ;(

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Re: Re: Re: Re: Useful Uses of regex code expressions?
by Anonymous Monk on Jun 27, 2002 at 22:36 UTC
    Regarding 1: That most certainly is an undocumented feature

    It is documented in the chunk of perlre you quoted 

    ... or look-ahead/look-behind/evaluate zero-width assertion.

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    It can be an integer or

    • a look-ahead zero width assertion
    • a look-behind zero width assertion
    • an evaluate zero width assertion
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