Of course wmap() and count() are going to be the slowest, because they go through the string twice: once to split it into individual elements, and again to compare each element to the desired one. The index() approach is very certainly the fastest. I wrote a function called aindex() a long time ago that did just that -- used index to step through a string and return all the indices of a substring in that string.
Jeff japhy Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and perl hacker
How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart

In reply to Re^3: Producing a list of offsets efficiently by japhy
in thread Producing a list of offsets efficiently by BrowserUk

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