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Benchmark: timing 10 iterations of RegExp, lc...
    RegExp: 66 wallclock secs (66.20 CPU) @  0.15/s (n=10)
        lc:  6 wallclock secs ( 5.47 CPU) @  1.83/s (n=10)

#!/usr/bin/perl

...
    lc => \&use_lc,
});