[issue25953] re fails to identify invalid numeric group references in replacement strings

[SilentGhost]

SilentGhost added the comment:

Updated patch taking Serhiy's comments into account.

There was another case on line 725 for when zero is used as a group number, I'm not sure though if it falls within the scope of this issue, so it's not included in the current patch.

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versions:  -Python 3.5
Added file: http://bugs.python.org/file45158/25953_3.diff

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