[issue32067] Deprecate accepting unrecognized braces in regular expressions

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Since this will require changing regular expressions in several places in the stdlib I have chosen emitting PendingDeprecationWarning and long deprecation period.

But I'm now not sure that this is a good idea. Non-escaped braces can be used much in a wild. It may be better to use other heuristic for recognizing the fuzzy matching and other possible extensions that use braces.

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<https://bugs.python.org/issue32067>
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