Fix a bug in the main PCRE.

Seems like in `[^$]`, the `$` does not mean “the end point” but just
“dollars”. Performances are equivalent with the new proposal.
[auto] Merge from Irc

    • #dfdf1ec — Fix a bug in the main PCRE. (Ivan Enderlin, 2014-02-27)

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Merge branch 'master' of /var/lib/git/repositories/Library/Irc