Can't get python replace regex to work

Question

Can't get the code to work, following code should replace what ever is after = and before "

user = "/silent test=de";

#!/usr/bin/python
import re
import fileinput

langids = ["de","uk","us","dk"]

for lang in langids:
 for line in fileinput.FileInput("C:\Users\HS\Desktop\sps_r2850\Test.txt",inplace=1):
    if re.match(".*user = \"[a-zA-Z/_= ]*\";.*", line):
        line = ("user = \"/silent test=_%s\";\n" % lang)
    print line,

First, better use raw strings when dealing with strings that contain backslashes (like Windows file paths and regexes). Then, how is your code "not working"? Does it match the wrong texts? Doesn't it match anything? Doesn't it replace the right parts? — Tim Pietzcker
– Tim Pietzcker, Commented Nov 15, 2012 at 8:27
1. where exactly is it replacing anything? you arent even using re.sub — Inbar Rose
– Inbar Rose, Commented Nov 15, 2012 at 8:31
Hey i'm a noob regex in python, however this code doesn't do anything. If i create a line in TEST.txt : 'user = "/silent test=tat";' then nothing happen, after i have run the code. — user1823753
– user1823753, Commented Nov 15, 2012 at 8:41

Chris Seymour · Accepted Answer · 2012-11-15 09:01:33Z

3

Change the language using re.sub:

import re

# no value set (or any doesn't matter)
line='user = "/silent test=";'

# values to insert 
langids = ["de","uk","us","dk"]

for lang in langids: 
     print re.sub('(.*=)(.*)(".*)',r'\1'+lang+r'\3',line)

# output
>>> user = "/silent test=de";
>>> user = "/silent test=uk";
>>> user = "/silent test=us";
>>> user = "/silent test=dk";

edited Nov 15, 2012 at 9:01

answered Nov 15, 2012 at 8:31

Chris Seymour

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4 Comments

user1823753 Over a year ago

Can't use this, since "de" is a random ID. So i have to use regex to find the ID, and i need to change that random ID with my own ID.

user1823753 Over a year ago

Great thx, but this just overwrite the lang. Can you do so it don't overwrite, but instead pick the next lang after a loop?

Talvalin Over a year ago

On that basis, please edit the question to include example input and expected output, as it is not clear what is required.

Chris Seymour Over a year ago

@user1823753 nothing is overwritten, the output is displayed (i.e print) it does go through all the languages in the loop? I not sure what you asking for?

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