Regex re.sub list in a file

Question

I have a text list that will re.sub fine with some like: re.sub('0000', '1111',data).

A replace pattern ^(.{4})(.{4})(.{3})(.{3}) with \1\4\2\3 for one input in the shell works fine also. However, my attempt to use this pattern in a list gives me an undesirable result on the first row and never replace the latters. What am I missing here?

"0000-22N-06W-01"
"0000-22N-06W-02"
"0000-22N-06W-03"
"0000-22N-06W-04"

import re
o = open("output.txt","w")
data = open("input.txt").read()
o.write(re.sub(r'^(.{4})(.{4})(.{3})(.{3})', r'\1\4\2\3',data))
o.close()

Answer 1

"0000-22N-06W-01"
"0000-22N-06W-02"
"0000-22N-06W-03"
"0000-22N-06W-04"

import re
output = open("output.txt","w")
input = open("input.txt")

for line in input:
    output.write(re.sub(r'^(.{4})-(.{3})-(.{3})-(.{2})$', r'\1-\4-\2-\3', line))

input.close()
output.close()

NOTE: If you actually have " in your data then you should change your regular expression to this one:

^"(.{4})-(.{4})-(.{3})-(.{3})"$

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