I get the same performance for both: 
        Rate  index regexp
index  299/s     --    -5%
regexp 316/s     6%     --

        Rate regexp  index
regexp 294/s     --   -12%
index  332/s    13%     --

        Rate regexp  index
regexp 303/s     --    -3%
index  313/s     3%     --

[download]

That's what I'd expect, since index and regex matches use the same algorithm (Boyer-Moore) to find constant strings

In reply to Re: is index faster than regexp for fixed text token? by ikegami
in thread is index faster than regexp for fixed text token? by sflitman

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