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Cut in PHP

Discussion in 'Programming, Scripting & Coding Discussion' started by beingchinmay, Jun 7, 2016.

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  1. beingchinmay

    beingchinmay ECZ Member

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    The rarely used once-only subpattern, or cut, prevents worst-case behavior by the regular expression engine on some kinds of patterns. Once matched, the subpattern is never backed out of.


    The common use for the once-only subpattern is when you have a repeated expression that may itself be repeated:

    This code snippet takes several seconds to report failure:


    This is because the regular expression engine tries all the different places to start the match, but has to backtrack out of each one, which takes time. If you know that once something is matched it should never be backed out of, you should mark it with (?>subpattern):


    The cut never changes the outcome of the match; it simply makes it fail faster.



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