bpo-42353: Add prefixmatch APIs to the re module #31137
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Adds prefixmatch APIs to the re module.
These alleviate common confusion around what "match" means as Python is
different than other popular languages in our use of the term as an API
name. The original "match" names are NOT being deprecated. Source
tooling like linters are expected to suggest using prefixmatch instead
of match to improve code health and reduce cognitive burden of
understanding the intent when reading code.
See the documentation changes within this PR for a better description.
[STATUS: I'm not happy with the current implementation in the PR branch - I want to make this more conservative and not define multiple functions but instead have both names just be a reference to the same function/method]
https://bugs.python.org/issue42353