Hi... The Nilsimsa algorithmen is a digest technique for determining the similarity of text messages (e.g. spam detection...) Calling out to the standalone program is not very efficient, but CPAN seemingly contains a modified version with only xx lines C for Perl interfacing. Any "bored" Ruby guru out there who can take a look how much effort a port from Perl to Ruby interfaces would take? I lack the knowledge of Ruby<-->C .... :-/ Thanks! Martin