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Re^2: A regex that only matches at offset that are multiples of a given N?

by 7stud (Deacon)
on Feb 14, 2013 at 18:57 UTC ( #1018767=note: print w/replies, xml ) Need Help??


in reply to Re: A regex that only matches at offset that are multiples of a given N?
in thread A regex that only matches at offset that are multiples of a given N?

In this regex:
fred (? (?{ pos % 4 != 0 }) (?!) ) (....)

What does this construct do:

(?stuff)

I can't find anything about that in perlre.

Edit: Ah, the boolean test finally clued me in:

(?(condition)yes-pattern)

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Re^3: A regex that only matches at offset that are multiples of a given N?
by smls (Friar) on Feb 15, 2013 at 12:27 UTC
    I can't find anything about that in perlre.

    perlre is not exactly optimized for quickly finding out the meaning of a specific regex construct.

    Use perlreref for that.

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