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use warnings;
use strict;
...
  'One Big Regexp' => \&one_re,
  'With index()'   => \&use_index,
});

bigre: (?-xism:\b(?:create|drop|delete|update|insert)\b)
several_re: 5
...
Several Regexp 24634/s             --           -24%           -50%
With index()   32367/s            31%             --           -34%
One Big Regexp 49358/s           100%            52%             --