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
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
--
Gabriel Genellina
--
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