Gabriel Genellina wrote:
> En Wed, 16 Dec 2009 14:51:08 -0300, Peter Otten <__pete...@web.de>
> escribió:
>
>> Ed Keith wrote:
>>
>>> --- On Wed, 12/16/09, Gabriel Genellina <gagsl-...@yahoo.com.ar> wrote:
>>>
>>>> Ed Keith <e_...@yahoo.com>
>>>> escribió:
>>>>
>>>> > I am having a problem when substituting a raw string.
>>>> When I do the following:
>>>> >
>>>> > re.sub('abc', r'a\nb\nc', '123abcdefg')
>>>> >
>>>> > I get
>>>> >
>>>> > """
>>>> > 123a
>>>> > b
>>>> > cdefg
>>>> > """
>>>> >
>>>> > what I want is
>>>> >
>>>> > r'123a\nb\ncdefg'
>>>>
>>>> So you'll have to double your backslashes:
>>>>
>>>> py> re.sub('abc', r'a\\nb\\nc', '123abcdefg')
>>>> '123a\\nb\\ncdefg'
>>>>
>>> That is going to be a nontrivial exercise. I have control over the
>>> pattern, but the texts to be substituted and substituted into will be
>>> read
>>> from user supplied files. I need to reproduce the exact text the is read
>>> from the file.
>>
>> There is a helper function re.escape() that you can use to sanitize the
>> substitution:
>>
>>>>> print re.sub('abc', re.escape(r'a\nb\nc'), '123abcdefg')
>> 123a\nb\ncdefg
>
> Unfortunately re.escape does much more than that:
>
> py> print re.sub('abc', re.escape(r'a.b.c'), '123abcdefg')
> 123a\.b\.cdefg
Sorry, I didn't think of that.
> I think the string_escape encoding is what the OP needs:
>
> py> print re.sub('abc', r'a\n(b.c)\nd'.encode("string_escape"),
> '123abcdefg')
> 123a\n(b.c)\nddefg
Another possibility:
>>> print re.sub('abc', lambda m: r'a\nb\n.c\a', '123abcdefg')
123a\nb\n.c\adefg
Peter
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