Re^2: Why doesn't this regex work? ( lookaround backtracking pos)

there is one \s and it is outside of the lookaround ... so its checking every other number

BINGO! Thank you.

If I put the first space into a lookbehind: s[(?<=\s)(\d+)\d\K\s(?=(\d+)\d\s)]{

Or substitute the zero length \b--which will serve the same purpose: s[\b(\d+)\d\K\s(?=(\d+)\d\s)]{

The substitution works as I wanted it to.

But damn I could not see that for looking.

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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Re^3: Why doesn't this regex work? ( lookaround dynamic postponed pattern (??{ code }) by Anonymous Monk on Aug 15, 2013 at 12:08 UTC
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` [download]	[reply] [d/l]
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.	[reply] [d/l] [select]