[3.6] bpo-31672: Fix string.Template accidentally matched non-ASCII identifiers (GH-3872) #3982
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…dentifiers (pythonGH-3872) Pattern `[a-z]` with `IGNORECASE` flag can match to some non-ASCII characters. Straightforward solution for this is using `IGNORECASE | ASCII` flag. But users may subclass `Template` and override only `idpattern`. So we want to avoid changing `Template.flags`. So this commit uses local flag `-i` for `idpattern` and change `[a-z]` to `[a-zA-Z]`.. (cherry picked from commit b22273e)
warsaw
reviewed
Oct 13, 2017
Doc/library/string.rst
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| While *flags* is kept to ``re.IGNORECASE`` for backward compatibility, | ||
| you can override it to ``0`` or ``re.IGNORECASE | re.ASCII`` when | ||
| subclassing. It's simple way to avoid unexpected match like above example. |
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This last sentence ("It's...") has some grammatical problems, and I don't think it's actually necessary. Can you remove it please?
methane
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Oct 14, 2017
This sentence is removed while backporting to 3.6 branch. See python#3982 (comment)
methane
added a commit
that referenced
this pull request
Oct 14, 2017
This sentence is removed while backporting to 3.6 branch. See #3982 (comment)
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Pattern
[a-z]withIGNORECASEflag can match to some non-ASCII characters.Straightforward solution for this is using
IGNORECASE | ASCIIflag.But users may subclass
Templateand override onlyidpattern. So we want toavoid changing
Template.flags.So this commit uses local flag
-iforidpatternand change[a-z]to[a-zA-Z]..(cherry picked from commit b22273e)
https://bugs.python.org/issue31672