CODEWITHSUNDEEP
pythonregex
Cyberzomie
Cyberzomie

Reputation: 93

Regular Expression Not matching the value

I have a file saving IP addresses to names in format

<<%#$192.168.8.40$#% %#@Name_of_person@#% >>

I read This file and now want to extract the list using pythons regular expressions

list=re.findall("<<%#$(\S+)$#%\s%#@(\w+\s*\w*)@#%\s>>",ace)
    print list

But the list is always an empty list..

can anyone tell me where is the mistake in the regular expression

edit-ace is the variable saving the contents read from the file

Upvotes: 1

Views: 94

Answers (3)

moxwose
moxwose

Reputation: 1

u use a invalid regex pattern. you may use r"<\%#\$(\S+)\$#\%\s\%#@(\w+\s*\w*)@#\%\s>>" replace "<<%#$(\S+)$#%\s%#@(\w+\s*\w*)@#%\s>>" in fandall method

good luck~!

Upvotes: 0

Jon Clements
Jon Clements

Reputation: 142136

Something like:

text = '<<%#$192.168.8.40$#% %#@Name_of_person@#% >>'
ip, name = [el[1] for el in re.findall(r'%#(.)(.+?)\1#%', text)]

If you can get any with just splitting on '@' and '$' then...

from itertools import itemgetter

ip, name = itemgetter(1, 3)(re.split(r'[@\$]', text))

You could also just use built-in string functions:

tmp = text.split('$')
ip, name = tmp[1], tmp[2].split('@')[1]

Upvotes: 0

skunkfrukt
skunkfrukt

Reputation: 1570

$ is a special character in regular expressions, meaning "end of line" (or "end of string", depending on the flavour). Your regex has other characters following the $, and as such only matches strings that have those characters after the end, which is impossible.

You will need to escape the $, like so: \$

I would suggest the following regular expression (formatted as a raw string since you are using Python):

 r"<<%#\$([^$]+)\$#%\s%#@([^@]+)@#%\s>>"

That is, <<%#$, then one or more non-$ characters, $#%, a whitespace character, %#@, one or more non-@ characters, @#%, whitespace, >>.

Upvotes: 4

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