Re: How to expand a string

[sh1tn]

perlcheat and perlrequick will gladly answer how to substitute either A or G in this position

[Anonymous Monk]

Thanks, but I don't just want to substitute, what I need to get and store is all the possible sequences from such a string. The real strings are DNA sequences 24 letters long and any of these letters may actually represent 2 or more possibilities.