[issue23690] re functions never release GIL

[Evgeny Kapun]

Evgeny Kapun added the comment:

Aren't Python strings immutable?

Also, match functions still permit execution of signal handlers, which can execute any Python code.

If GIL is needed during matching, can it be released temporarily to permit thread switching?

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<http://bugs.python.org/issue23690>
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