Thanks, all the replies are helping me get there but it's still a bit of a nightmare to code. Here's some example inputs etc.

R = A or G
S = C or G
K = G or T
All the other letters stay constant.

my $seq1 = "CAG GTR CAG CTG AAG SAG TCA GG";
my $seq2 = "GAK GTG CAG CTT CAG CAG TCR GG";

The gaps between sets of 3 letters aren't important - it just signifies DNA codons.

So, both seq 1 and seq 2 have 4 possible resulting sequences. I need to store the 4 seqs associated with seq 1 separately e.g. in a different array to those of seq 2.

If you have any ideas about the best way to do this I'd be very grateful! Speed isn't a big consideration, as long as it works!

Thanks for your help.

In reply to Re^4: How to expand a string by Anonymous Monk
in thread How to expand a string by Anonymous Monk

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