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use Benchmark;

...
        $string =~ s/\+/ /g;
    },
});

Benchmark: running aa, bb, cc, dd, ee, ff, each for at least 3 CPU sec
+onds...
        aa:  6 wallclock secs ( 2.91 usr +  0.10 sys =  3.01 CPU) @ 42
+9021.93/s (n=1291356)
...
        dd: 11 wallclock secs ( 6.39 usr +  0.02 sys =  6.41 CPU) @ 14
+9619.66/s (n=959062)
        ee: 12 wallclock secs ( 5.97 usr +  0.03 sys =  6.00 CPU) @ 52
+0242.00/s (n=3121452)
        ff:  7 wallclock secs ( 6.01 usr +  0.00 sys =  6.01 CPU) @ 60
+7347.25/s (n=3650157)