[issue35846] Incomplete documentation for re.sub

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

This is a duplicate of issue28450.

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nosy: +serhiy.storchaka
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> Misleading/inaccurate documentation about unknown escape 
sequences in regular expressions

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[issue35846] Incomplete documentation for re.sub

[Windson Yang]

Windson Yang  added the comment:

I wonder if possible that c not in ASCIILETTERS when we get KeyError?

if c in ASCIILETTERS:
raise s.error('bad escape %s' % this, len(this))

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nosy: +Windson Yang

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[issue35846] Incomplete documentation for re.sub

[Pascal Bugnion]

New submission from Pascal Bugnion :

The documentation for `re.sub` states that "Unknown escapes such as ``\&`` are 
left alone.". This is only true for escapes which are not ascii characters, as 
far as I can tell (c.f. source on 
https://github.com/python/cpython/blob/master/Lib/sre_parse.py#L1047).

Would there be value in amending that documentation to either remove that 
sentence or to clarify it? If so, I'm happy to submit a PR on GitHub.

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components: Regular Expressions
messages: 334504
nosy: ezio.melotti, mrabarnett, pbugnion
priority: normal
severity: normal
status: open
title: Incomplete documentation for re.sub
versions: Python 3.7, Python 3.8

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