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    $ perl -Dr /tmp/qq 2>&1 | grep Compiling
    Compiling REx `^(.{2}).{2}(.*)$'
    $

#!/usr/bin/perl
                     
...
regex_qr 38207/s       --      -3%     -62%
regex    39497/s       3%       --     -60%
substr   99555/s     161%     152%       --