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Re^2: Reguar expression

by citromatik (Curate)
on Jun 22, 2009 at 10:45 UTC ( #773566=note: print w/ replies, xml ) Need Help??

in reply to Re: Reguar expression
in thread Reguar expression

That's not very complicated:

Well, maybe, but you are not asking the OP. That is: "I need a regular expression to match the following pattern.". You are using 2. (and perliff above uses 3!).

Update: Solving the problem with 2+ regexps is more or less trivial, but using just 1 is far more interesting. Here is a solution using look-ahead assertions (see perlre):

my $re = qr{ ^ # match at the beginning. (?! # Look-ahead assertion: Fail if the next matc +hes .* first # match "first" everywhere except at the begi +nning of the string ) # end of look-ahead assertion This .* \. # Match "This" (at the beginning), followed b +y anything and a dot $ # Match the end of a string. }x; # Allow these comments


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