Python regular expression problem

I need to do something in regex but I'm really not good at it, long time didn't do that .

/a/c/a.doc

开发者_Python百科

I need to change it to

\\a\\c\\a.doc

Please trying to do it by using regular expression in Python.

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I'm entirely in favor of helping user483144 distinguish "solution" from "regular expression", as the previous two answerers have already done. It occurs to me, moreover, that os.path.normpath() http://docs.python.org/library/os.path.html might be what he's really after.

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why do you think you every solution to your problem needs regular expression??

>>> s="/a/c/a.doc"
>>> '\\'.join(s.split("/"))
'\\a\\c\\a.doc'

By the way, if you are going to change path separators, you may just as well use os.path.join

eg

mypath = os.path.join("C:\\","dir","dir1")

Python will choose the correct slash for you. Also, check out os.sep if you are interested.

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You can do it without regular expressions:

x = '/a/c/a.doc'
x = x.replace('/',r'\\')

But if you really want to use re:

x = re.sub('/', r'\\', x )

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\\ is means "\\" or r"\\" ?

re.sub(r'/', r'\\', 'a/b/c')

use r'....' alwayse when you use regular expression.

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'\\\'.join(r'/a/c/a.doc'.split("/"))