Python字典自动转义正斜杠

Question

I have a class, and in this class I want to store a variable that contains a regular expression. In this case something to identify an IP address:

class Foo:
'''a class to parse through an sosreport and begin the cleaning process required in many industries'''

def __init__(self, somefile):

    self.version = '0.1'
    self.somefile = somefile
    self.network_search = {'strings':('foo','bar','foobar','barfoo',), 'regex':"(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})"}

Unfortunately, when I call the variable from a prompt I get this:

>>> a = Foo('sosreport')
>>> a.network_search['regex']
'(\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})'

Is it possible to do this? Is there a better way? I've tried single and double quotes, but can't think of a way around it.

Answer 1

The confusion here is between regexes proper and strings.
You build a regex from a string, and if you print a regex (as you are implicitly doing; well, technically you're not actually printing, but getting a string representation) then you get a string. The string has to show the backslashes as escaped, but the regex's internal representation is actually doing what you want.

Answer 2

apparently it works anyway...

>>> a = Foo('somefile')
>>> a.network_search['regex']
'(\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})'
>>> import re
>>> string1 = 'ip addy is 192.168.1.153 so there'
>>> x=a.network_search['regex']
>>> m = re.search(x,string1)
>>> if m:
...   print your IP matches
... 
your IP matches
>>> string2 = 'no ip addy so there'
>>> n = re.search(x,string2)
>>> if n:
...   print "your IP matches"
... 
>>>