String matching in Python

does anyone know which string matching alg开发者_StackOverflow中文版orithm is implemented in Python?

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Per the sources, it's a

fast search/count implementation, based on a mix between boyer-moore and horspool, with a few more bells and whistles on the top. for some more background, see: http://effbot.org/zone/stringlib.htm

The essay in question is really well worth reading!

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I assume you're talking about CPython. In that case, you could always check the source (see fastsearch.h).