On Apr 4, 2007, at 4:48 PM, Trevor Wennblom wrote: > > Should be > > puts Bio::Sequence::NA.new("tan").to_re # => (?-mix:ta[atgcn]) > Oh right - actually it should be all inclusive, so "n" should match "yrwskmbdhvnatgcu". In this case for the example giving: puts Bio::Sequence::NA.new("tan").to_re # => (?-mix:ta [yrwskmbdhvnatgcu]) Trevor