I think a slightly simpler approach is to regex directly on the strings, combine the strings and then dedup:
#! perl -slw
use strict;
use Data::Dump qw[ pp ];
my @array = ("11 12","11 13", "9 8 7", "3 4", "11 4") ;
## combine
AGAIN: for my $i ( 0 .. $#array ) {
for my $j ( 0 .. $#array ) {
next if $i == $j;
while( $array[ $j ] =~ m[(\d+)]g ) {
my $n = $1;
if( $array[ $i ] =~ m[\b$n\b] ) {
$array[ $i ] .= ' ' . splice @array, $j, 1;
goto AGAIN;
}
}
}
}
## dedup
for ( @array ) {
1 while s[(\b\d+)(?:\s|$)(?=.+\1)][]g;
}
pp \@array;
__END__
c:\test>897418
["12 13 11 3 4", "9 8 7"]
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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