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    use Benchmark;
    use vars qw/$a $b $c/;
...
            }
        },
    });

 chromatic: 11 wallclock secs (10.67 usr +  0.00 sys = 10.67 CPU) @ 46
+860.36/s (n=500000)
chromatic2: 10 wallclock secs ( 8.81 usr +  0.00 sys =  8.81 CPU) @ 56
+753.69/s (n=500000)
lookbehind: 10 wallclock secs ( 9.42 usr +  0.00 sys =  9.42 CPU) @ 53
+078.56/s (n=500000)
    substr:  4 wallclock secs ( 3.98 usr +  0.00 sys =  3.98 CPU) @ 12
+5628.14/s (n=500000)