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Probably not the most efficient implementation (and maybe incomplete), but if you can't get the modules to work, you could wrap this up as a subroutine.

#! perl -slw use strict; use Data::Dumper; my $needle = 'the lazy cat'; my $haystack = 'the quick brown fox jumps over the lazy dog'; my @matches; for my $start (0..length $needle) { for my $len ($start+1 .. length $needle) { my $substr = substr($needle, $start, $len); push @matches, $haystack =~ m[($substr)]g; } } my ($len, $longest) = 0; length > $len and ($longest, $len) = ($_, length) for @matches; print "The longest common substring between\n", $needle, "\nand\n", $h +aystack, "\nis '$longest'"; __END__ C:\test> The longest common substring between the lazy cat and the quick brown fox jumps over the lazy dog is 'the lazy ' C:\test>

Examine what is said, not who speaks.
1) When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.
2) The only way of discovering the limits of the possible is to venture a little way past them into the impossible
3) Any sufficiently advanced technology is indistinguishable from magic.
Arthur C. Clarke.

In reply to Re: Longest Common Substring by BrowserUk
in thread Longest Common Substring by rkg

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