ignore case only for a part of the regex?

Vlastimil Brom vlastimil.brom at gmail.com
Sun Dec 30 17:38:31 CET 2012

2012/12/30 Helmut Jarausch <jarausch at skynet.be>:
> Hi,
> is there a means to specify that 'ignore-case' should only apply to a part
> of a regex?
> E.g.
> the regex should match  Msg-id:, Msg-Id, ...  but not  msg-id: and so on.
> I've tried the pattern
> r'^Msg-(?:(?i)id):'
> but (?i) makes the whole pattern ignoring case.
> In my simple case I could say
> r'Msg-[Ii][Dd]:'
> but that's a bit clumsy.
> Is there a more elegant way? Is there a way to compose a pattern
> from subpatterns which are compiled with different flags?
> Many thanks for a hint,
> Helmut.
> --
> http://mail.python.org/mailman/listinfo/python-list

you may check the new regex implementation for python
which allows (among many other improvements) for scoped flags:

>>> import regex
>>> regex.findall(r"Msg-(?i:id):", "the regex should match  Msg-id:, Msg-Id:, ...  but not  msg-id:, MSG-ID:  and so on")
['Msg-id:', 'Msg-Id:']


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