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Re^3: How to get ($1, $2, ...)?

by varian (Chaplain)
on Feb 16, 2007 at 16:35 UTC ( #600473=note: print w/replies, xml ) Need Help??


in reply to Re^2: How to get ($1, $2, ...)?
in thread How to get ($1, $2, ...)?

If you really need to hang on to the //gmc regex construct then you could opt to include the regex's as alternatives. Afterwards split the grouped result per regex based on field position in the group.
Update:
- note that the order of the alternatives influences which one will match first each time (and that's what you wanted right?)
- since the total regex is just one expression your program will examine the text only once -> performance gain

See below for an example to get the idea.

#!/usr/bin/perl use strict; use warnings; my $text = <<TEXT; Title: The Moor's Last Sigh, Author: Salman Rushdie Title: The God of Small Things, Author: Arundhati Roy Title: A very special title, Author: varianf varians TEXT my @answers; my $re = qr/Title: (.*?), Author: (\w+) (\w+)$/; # 3 groups here my $re2= qr/Title: (.*?special.*?), Author: (\w+) (\w+)$/; my (@MatchAll) = ($text =~ /$re2|$re/mgc); my (@Match1,@Match2); for (my $i=0;$i<@MatchAll;$i=$i+6) { defined $MatchAll[$i] && push @Match2, $MatchAll[$i..$i+2]; defined $MatchAll[$i+3] && push @Match1, $MatchAll[$i+3..$i+5]; } Output: $ perl reg.pl .$VAR1 = [ 'A very special title', 'varianf', 'varians' ]; $VAR1 = [ 'The Moor\'s Last Sigh', 'Salman', 'Rushdie', 'The God of Small Things', 'Arundhati', 'Roy' ];
P.S.: I hardcoded the boundaries for the captured fields to shortcut the coding here. Naturally this part could/should be coded more flexible if you deal with a lot of regex's.

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