in reply to Re^2: Why doesn't this regex work? ( lookaround backtracking pos)
in thread Why doesn't this regex work? (Solved!)

Took me a few dozen looks, I started to compose some funny(wrong) answers some 3-4 times

The experimental (??{ code }) feature looks kinda neat 

perl -le " $_ = shift; s{(\d+)\d\s\K(?=(??{$1+1})\d\s)}{\n}g; print " 
+"11 12 21 22 32 33 41 44" 
11 12
21 22
32 33
41 44

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Re^4: Why doesn't this regex work? ( lookaround dynamic postponed pattern (??{ code })
by BrowserUk (Patriarch) on Aug 15, 2013 at 12:44 UTC
    Took me a few dozen looks, I started to compose some funny(wrong) answers some 3-4 times

    Makes me feel a little better that I'm not the only one had trouble seeing it :)

    The experimental (??{ code }) feature looks kinda neat

    Indeed. Trouble is I can never remember whether it is the (?{}) or (??{}) that interpolates; and rather than go look it up, I opt for an alternative if one springs to mind.

    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.
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