[New-bugs-announce] [issue24929] _strptime.TimeRE should not enforce range in regex

[Steve Yeung]

New submission from Steve Yeung:

Currently, the regex in TimeRE enforces the numeric ranges. For example:
    'm': r"(?P<m>1[0-2]|0[1-9]|[1-9])",

As a result, an invalid month will cause an generic regex error:
    ValueError: time data '2015/16/5' does not match format '%Y/%m/%d'

However, if we relax the regex to not check the range and allow datetime to handle it:
    'm': r"(?P<m>\d{1,2})"

The error will be handle in datetime instead and the error will be much more helpful:
    ValueError: month must be in 1..12

Please consider relaxing the regex for numeric ranges in _strptime.TimeRE.

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components: Library (Lib)
messages: 249074
nosy: Steve Yeung
priority: normal
severity: normal
status: open
title: _strptime.TimeRE should not enforce range in regex
type: behavior
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24929>
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