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my $a = "AAAAXRXAAAAAXKXAAAAAXRPXAAA" # sample sequence @digested0 = split(/[KR](?!P)/, $orf); # cut at every K or R, except i +f followed by a P print join("\n",@digested0);
AAAAX XAAAAAX XAAAAAXRPXAAA
AAAAXR XAAAAAXK XAAAAAXRPXAAA