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UPGRADING:
Please make sure that not background processes are running before deploying the new code. If processes are running, you may need to restart the webserver and manually unlock old processes.
Initial commit of 7.x-2.x branch. Do less in the regular expression and more in the callback. This should make dealing with edge cases (and they're all edge cases) easier in the future, at the cost of making Pathologic possibly slower, though its results should be cached anyway.