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From: Richard Stallman <rms@gnu.org>
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Subject: Re: skip-chars-forward v. re-search-forward
Date: Thu, 03 Apr 2003 17:53:26 -0500
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    Both skip-chars-forward and re-search-forward are builtin functions.  But
    re-search-forward uses a cache for recently used regexps to avoid the
    overhead of compiling it, whereas skip-chars-forward always sets up the
    search map anew.

If skip-chars-forward had a cache, it would probably run faster
than regexp searching.