[issue846388] Check for signals during regular expression matches

[Ralf Schmitt]

Ralf Schmitt added the comment:

hm. just noticed that calling PyErr_CheckSignals slows down regular
expression matching considerably (50%).

I'm adding another patch, which only checks every 4096th iteration for
signals.

Added file: http://bugs.python.org/file8680/patch.speedup

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