New submission from Reuven Lerner <[email protected]>:
I just discovered that having whitespace inside of {min,max} causes the regexp
to report no matches, rather than an error:
>>> import re
>>> s = 'abbcccddddeeeee'
>>> re.findall('d{1, 4}', s)
[]
>>> re.findall('d{1,4}', s)
['dddd']
Ruby and JavaScript have the same behavior, so maybe this is standard in some
way. But I find it hard to believe that it's desirable. (My post on Twitter
about this confirmed that a whole lot of people were bitten by this bug in the
past.)
BSD grep, GNU grep, and GNU Emacs all raise an error upon encountering this
whitespace, which strikes me as less surprising and more useful behavior.
----------
components: Regular Expressions
messages: 381879
nosy: ezio.melotti, mrabarnett, reuven
priority: normal
severity: normal
status: open
title: Space in re's {min,max} should raise an error, rather than fail silently
versions: Python 3.9
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Python tracker <[email protected]>
<https://bugs.python.org/issue42469>
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