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use strict;
use warnings;
...
     }
}
1;

old string: ?a? ?b? ?c?
 one --- 
...
IMP_REPLACE:  0 wallclock secs ( 0.10 usr +  0.00 sys =  0.10 CPU) @ 1
+000000.00/s (n=100000)
            (warning: too few iterations for a reliable count)
STD_REPLACE:  6 wallclock secs ( 4.99 usr +  0.00 sys =  4.99 CPU) @ 2
+0040.08/s (n=100000)