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Re^3: Delimited Backtracking with Regex

by blokhead (Monsignor)
on Apr 21, 2006 at 03:07 UTC ( #544766=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Delimited Backtracking with Regex
in thread Delimited Backtracking with Regex

You can still do the same thing using lexicals (if you are allergic to using symbol-table variables). The only thing to be careful is to reuse the same push statement and same target array every time. This is adapted from the code in Re^3: Regexes: finding ALL matches (including overlap):

{ my @matches; my $push = qr/(?{ push @matches, $1 })/; sub match_all_ways { my ($string, $regex) = @_; @matches = (); $string =~ m/($regex)$push(?!)/; return @matches; } } print match_all_ways( "TXXXABCDGXXXCCCDTGYYYCCCYYYCC", qr/XXX.*YYY/ );
Technically, $push is not needed -- you could just include (?{push @matches, $1}) in the m// statement inline. However, I like this way as it makes it a much more obvious that this part of the regex is only compiled once.

blokhead


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