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Hmmm...I tried your code and I am confused by at least the outputs for some inputs. Maybe you have an explanation for the following result? (I must confess, I really tried the code out since I have never used ^N before, so I apologize if I'm missing something here).

sub lcs{ our %subs = (); my $n = @_; shift =~ m[^.*(.+)(?{ $subs{ $^N }++ })(?!)] while @_; my @subs = sort{ length $b <=> length $a } grep{ $subs{ $_ } == $n } keys %subs; return wantarray ? @subs : $subs[ 0 ]; } $" = ", "; my @inputs = ( ["ABCDEF", "BCD", "QXDAF"], #okay result ["AAAA", "AA"] #spurious result(???) ); for (@inputs) { @subs = lcs @$_; print "@$_=>@subs\n"; } __END__ __OUTPUT___ ABCDEF, BCD, QXDAF=>D AAAA, AA=>AAA


In reply to Re: Re: finding longest common substring (ALL common substrings) by welchavw
in thread finding longest common substring by revdiablo

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