[New-bugs-announce] [issue6630] string.Template custom pattern not working

[Javier]

New submission from Javier <javier.collado at gmail.com>:

In the string.Template documentation
(http://docs.python.org/library/string.html) it's explained that if a
custom regular expression for pattern substitution is needed, it's
possible to override idpattern class attribute (whose default value is
[_a-z][_a-z0-9]*).

However, if the custom pattern that is needed is just uppercase
letters, something like [A-Z]+ won't work because of the following line
in the _TemplateMetaclass class __init__ method:
cls.pattern = _re.compile(pattern, _re.IGNORECASE | _re.VERBOSE)

I would say that this is an error (IGNORECASE just shouldn't be there)
and that the line above should be:
cls.pattern = _re.compile(pattern, _re.VERBOSE)
and the default value for idpattern:
[_a-zA-Z][_a-zA-Z0-9]*

Do you agree on this? Is there any reason for the IGNORECASE option to
be passed to re.compile?

----------
components: IO, Regular Expressions
messages: 91217
nosy: jcollado
severity: normal
status: open
title: string.Template custom pattern not working
type: behavior
versions: Python 2.6, Python 3.0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6630>
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