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Re: weird regex question

by kennethk (Abbot)
on Apr 25, 2012 at 16:17 UTC ( #967108=note: print w/replies, xml ) Need Help??

in reply to weird regex question

You can get an explanation of any regular expression using YAPE::Regex::Explain. In this case, it outputs:

The regular expression: (?-imsx:^.{!}(.{5})) matches as follows: NODE EXPLANATION ---------------------------------------------------------------------- (?-imsx: group, but do not capture (case-sensitive) (with ^ and $ matching normally) (with . not matching \n) (matching whitespace and # normally): ---------------------------------------------------------------------- ^ the beginning of the string ---------------------------------------------------------------------- . any character except \n ---------------------------------------------------------------------- {!} '{!}' ---------------------------------------------------------------------- ( group and capture to \1: ---------------------------------------------------------------------- .{5} any character except \n (5 times) ---------------------------------------------------------------------- ) end of \1 ---------------------------------------------------------------------- ) end of grouping ----------------------------------------------------------------------

The issue is that the $! variable is interpolated to an empty string but ! operator doesn't get interpolated as such in the regular expression. Essentially, your modification is actually looking for the string literal {!}.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

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[Discipulus]: erix the right order of books is: The Three Musketeers, Twenty Years After, The Count of Moret; The Red Sphinx (not in the cycle but a must read!), The Vicomte de Bragelonne

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