$seq =~ s/
(\d+):(\d+):(\d+)
(?:;|\s)*
(\1):(\2):(?{1+($3|$6)})
/$1:$2:$3-$6/xg;
FWIW, the (?{1+($3|$6)})
expression | embedded code expression
in the quoted regex just
adds 1 to the bitwise-or of $3 and $6 (treated
as numbers... I think) and then throws away the result;
it's a no-op.
Give a man a fish: <%-{-{-{-<
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