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Re^2: Precompiling substitution regex

by FreakyGreenLeaky (Sexton)
on Jun 17, 2011 at 11:57 UTC ( #910131=note: print w/ replies, xml ) Need Help??


in reply to Re: Precompiling substitution regex
in thread Precompiling substitution regex

Thanks moritz, that will work. Is there any way of achieving that without having the substitutions in a separate array?


Comment on Re^2: Precompiling substitution regex
Re^3: Precompiling substitution regex
by moritz (Cardinal) on Jun 17, 2011 at 12:04 UTC
    Well, you could of course store an array of closures that each does a substitution, and call those in turn - but it might slow down things again. Or you could store regexes and substitutions in the same array, but distinguished by different indexes (even/odd or first half/second half).

    But I don't think you can easily store a precompiled whole substitution in a single scalar.

      ... store regexes and substitutions in the same array, but distinguished by different indexes ...

      An example of what I think moritz is referring to (and the way I think I would approach the problem):

      >perl -wMstrict -le "my @subs = ( [ qr{ (?i) foo | bar }xms => 'quux' ], [ qr{ fee | fie | foe }xms => 'fum' ], ); ;; my $string = 'foo fee BAR foe fOo fie FOE'; for my $ar_sub (@subs) { my ($search, $replace) = @$ar_sub; $string =~ s{$search}{$replace}g; } print qq{'$string'}; " 'quux fum quux fum quux fum FOE'

      Note that regex modifiers like /g cannot be associated with each individual regex using this approach; something a little more fancy is needed for that.

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