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Re^3: how to split the string into two or three numbers based on certain value.

by venky4289 (Novice)
on Feb 12, 2013 at 08:19 UTC ( #1018314=note: print w/ replies, xml ) Need Help??


in reply to Re^2: how to split the string into two or three numbers based on certain value.
in thread how to split the string into two or three numbers based on certain value.

Hi this works perfectly fine. Can you explain me the regulsr expression as i am nee to perl programming


Comment on Re^3: how to split the string into two or three numbers based on certain value.
Re^4: how to split the string into two or three numbers based on certain value.
by AnomalousMonk (Monsignor) on Feb 12, 2013 at 15:41 UTC
    Can you explain me the regulsr expression ...

    I can begin to explain it and then pass you off to some explanations in the docs that do a better job than I could.

    •  \G   Begin a 'global' search (i.e., a search controlled by the  /g regex modifier) at the exact position where the previous search left off, or at the start of the string (same as \A) if there was no previous search.
    •  (\d{2,3}?)   Capture two or three decimal digits. Because the  ? 'lazy' match modifier controls matching, try first to capture two digits (normal matching would be 'greedy' and try to grab three).
    •  (?(?{ $^N < 32 }) (*FAIL))   If the two digits captured by the immediately previous capture group (see  $^N   in perlvar) are numerically less than 32, fail that match and go back and try for three digits. Here's where I bail out. See Extended Patterns in perlre and search for the "(?(condition)yes-pattern)" discussion; also check the Conditional expressions section in perlretut. Check Special Backtracking Control Verbs in perlre for info on (*FAIL); see also the Backtracking control verbs discussion in perlretut. (Note that  (*FAIL) can be replaced by  (?!) if you're scared by the "WARNING: These patterns are experimental and subject to change..." language prefacing documentation of these verbs.)
    HTH.

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