You won't need capturing parentheses when evaluating in list context. Afaik does the .*? invoke a speed penalty, so that the expression might be optimized as:

     ...
     my @arr = $string =~ /
                      [^KR]+  # collect non K|R
                      .       # the following must be K|R
                      (?!P)   # ignore if fragment would start by P
                     /gsx;                
     ...

[download]

Regards

mwa

In reply to Re^3: cleaving a sequence with specific alphabets by mwah
in thread cleaving a sequence with specific alphabets by heidi

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