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  1. or download this
    $ perl -E'say "xxx" =~ s/(*MARK:a)^.|(*MARK:c).$|(*MARK:b)./$REGMARK/g
+r'
abc
  2. or download this
    $ python -c 'import pcre2; print(pcre2.sub("(*MARK:a)^.|(*MARK:c).$|(*
+MARK:b).", "$*MARK", "xxx"))'
abc