Hey all, I am trying to split a string into different parts, based on content (a protein sequence digested by enzymes cutting at different amino acids). I have tried: 
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);

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The output is: 
AAAAX
XAAAAAX
XAAAAAXRPXAAA

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It's basically correct but it should be 
AAAAXR
XAAAAAXK
XAAAAAXRPXAAA

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i.e. keeping the separator "K" or "R". How could I achieve this? There probably is a regexp for that as well, I'm just too blind to find it... Thanks! :-)

In reply to Splitting string (regex) while keeping the separator? by Cantello

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