You can't even use the named captures, as %+ is reset on each match, too. Fortunately, you can store the matching parts in variables - just make sure the assignment forces list context:

#!/usr/bin/perl
use warnings;
use strict;

my @output = qw( Xmatch3X Xmatch4X Xmatch0Xmatch2X
                 nomatch  nomatch  nomatchnomatch );
for my $x (0, 3) {
    if ($output[$x+2] !~ /.*match1.*/
        and my ($m1) = $output[$x+2] =~ /.*(match2).*/
        and my ($m2) = $output[$x]   =~ /.*(match3).*/
        and my ($m3) = $output[$x+1] =~ /.*(match4).*/
       ){
        print "Matched: $m1 $m2 $m3.\n";
    }
}
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The parentheses after my are needed for the list context.

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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