Raw string substitution problem

[Gabriel Genellina]

En Wed, 16 Dec 2009 11:09:32 -0300, Ed Keith <e_d_k at 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'

 From http://docs.python.org/library/re.html#re.sub

	re.sub(pattern, repl, string[, count])

	...repl can be a string or a function; if
	it is a string, any backslash escapes in
	it are processed. That is, \n is converted
	to a single newline character, \r is
	converted to a linefeed, and so forth.

So you'll have to double your backslashes:

py> re.sub('abc', r'a\\nb\\nc', '123abcdefg')
'123a\\nb\\ncdefg'

-- 
Gabriel Genellina