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    use Regexp::MatchContext -vars;

...
    print "After:   $POSTMATCH\n";

    $MATCH = 2 * $MATCH;    # substitute into original $str

              Rate     regex   context  at_minus matchvars
regex      17271/s        --      -22%      -66%      -84%
context    22239/s       29%        --      -56%      -79%
at_minus   50420/s      192%      127%        --      -53%
matchvars 107527/s      523%      384%      113%        --

            Rate    regex  context at_minus
regex    17544/s       --     -24%     -69%
context  23112/s      32%       --     -60%
at_minus 57361/s     227%     148%       --

#!/usr/bin/perl
use strict;
...
        },
    }
);