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#!/usr/bin/perl -w
use strict;
...
    substr:  2 wallclock secs ( 2.26 usr +  0.00 sys =  2.26 CPU)
    unpack:  4 wallclock secs ( 3.90 usr +  0.00 sys =  3.90 CPU)
unpack

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sub prematch {
    unpack sprintf("a%d",$-[0]), $_[0];
...
sub match {
    unpack sprintf ("x%d a%d", $-[0], $+[0] - $-[0] ), $_[0];
}