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Here's a bit-logic based approach:

#!/usr/bin/perl -w use strict; my %groups = ( group1 => ['cooling', 'rooting', 'hooting', 'looking', 'doormat', +'cooking', 'cookies', 'noodles'], # desired result "-oo----" group2 => ['yourself', 'southern'], # desired result "-ou--e--" group3 => ['arden', 'arlen', 'asked'] # desired result "a--e-" ); sub show_bits { #print unpack("B*", shift), "\n"; } for my $g (values %groups) { my $w1 = $g->[0]; my $and = "\xff" x length($w1); my $or = "\0" x length($w1); for my $w (@$g) { print "$w\n"; #print join(" " x 7, split //, $w), "\n"; show_bits($w); $and &= $w; show_bits($and); $or |= $w; show_bits($or); } my $xor = $and ^ $or; show_bits($xor); $xor =~ tr/\0/\xff/c; show_bits($xor); my $mask = ~$xor; show_bits($mask); my $common = $w1 & $mask; $common =~ tr/\0/-/; print "$common\n"; my $i = -1; print map {$i++; $_ ne "-" ? "$_ : $i\n" : ()} split //, $common; print "\n"; } __END__ yourself southern -ou--e-- o : 1 u : 2 e : 5 cooling rooting hooting looking doormat cooking cookies noodles -oo---- o : 1 o : 2 arden arlen asked a--e- a : 0 e : 3

Uncomment the commented out prints to see how the bit strings are being transformed/combined...

(Update: fixed cut-n-paste error $and ^= $or — thanks johngg)


In reply to Re: Matching or masking specific characters in an array of strings by almut
in thread Matching or masking specific characters in an array of strings by duggles

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