Cause you're using an old(ish) version of Perl? 

       Rate    b    a    c    d
b 3778652/s   --  -1% -19% -21%
a 3817631/s   1%   -- -18% -20%
c 4677165/s  24%  23%   --  -2%
d 4766254/s  26%  25%   2%   --

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This is perl 5, version 14, subversion 0 (v5.14.0) built for i686-linux-thread-multi

In reply to Re^2: Why does global match run faster than none global? by ikegami
in thread Why does global match run faster than none global? by Kc12349

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