gh-133306: Support \z as a synonym for \Z in regular expressions #133314
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sethmlarson
approved these changes
May 2, 2025
Lib/re/_parser.py
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| @@ -49,7 +49,8 @@ | |||
| r"\S": (IN, [(CATEGORY, CATEGORY_NOT_SPACE)]), | |||
| r"\w": (IN, [(CATEGORY, CATEGORY_WORD)]), | |||
| r"\W": (IN, [(CATEGORY, CATEGORY_NOT_WORD)]), | |||
| r"\Z": (AT, AT_END_STRING), # end of string | |||
| r"\z": (AT, AT_END_STRING), # end of string | |||
| r"\Z": (AT, AT_END_STRING), # end of string (deprecated) | |||
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Should we use "deprecated" language here if we're not deprecating \Z?
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What words do you suggest? "legacy"? "obsolete"?
Due to its subtle difference from other common implementations, it is very likely that \Z will be deprecated and removed in future, when it will be safe. It is kept for compatibility with older Python versions.
hugovk
approved these changes
May 3, 2025
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
|
Thank you for review. This feature is not platform-depended, so no need to spend the time and the resources on running the buildbots. |
Pranjal095
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to Pranjal095/cpython
that referenced
this pull request
Jul 12, 2025
pythonGH-133314) \Z was an error inherited from PCRE 0.95. It was fixed in PCRE 2.0. In other engines, \Z means not “anchor at string end”, but “anchor before optional newline at string end”. \z means “anchor at string end” in most RE engines.
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