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Re: ignore case only for a part of the regex?

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2012/12/30 Helmut Jarausch <jarausch@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

Hi,
you may check the new regex implementation for python
http://pypi.python.org/pypi/regex
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:']
>>>

hth,
 vbr

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re: ignore case only for a part of the regex? Helmut Jarausch <jarausch@skynet.be> - 2012-12-30 11:24 +0000
  Re: ignore case only for a part of the regex? Roy Smith <roy@panix.com> - 2012-12-30 10:20 -0500
    Re: ignore case only for a part of the regex? Joel Goldstick <joel.goldstick@gmail.com> - 2012-12-30 10:41 -0500
    Re: ignore case only for a part of the regex? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-01-01 04:14 +0000
      Re: ignore case only for a part of the regex? Vlastimil Brom <vlastimil.brom@gmail.com> - 2013-01-02 00:09 +0100
        Re: ignore case only for a part of the regex? wxjmfauth@gmail.com - 2013-01-02 06:17 -0800
        Re: ignore case only for a part of the regex? wxjmfauth@gmail.com - 2013-01-02 06:17 -0800
  Re: ignore case only for a part of the regex? Vlastimil Brom <vlastimil.brom@gmail.com> - 2012-12-30 17:38 +0100
    Re: ignore case only for a part of the regex? Roy Smith <roy@panix.com> - 2012-12-30 12:32 -0500
      Re: ignore case only for a part of the regex? MRAB <python@mrabarnett.plus.com> - 2012-12-30 18:04 +0000
      Re: ignore case only for a part of the regex? Cameron Simpson <cs@zip.com.au> - 2012-12-31 11:29 +1100

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