Hi Tux!
Thank you so much for the help!! If I may, can you take out one of the solutions, because I have hard time isolating one?
I tried this:
my $s = "AAAAAXXXXXXXAAAXXXXXAXXXXAAAAA";
$s =~s{A\K([^A]+)(?=A)} {"A" x length $1 };
print $s."\n";

[download]
but it does not print something proper.

In reply to Re^2: Replace all characters inbetween by Anonymous Monk
in thread Replace all characters inbetween by Anonymous Monk

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