How to use regexp on file, line by line, in Python

Question

Here is my regexp: f\\(\\s*([^,]+)\\s*,\\s*([^,]+)\\s*\\)

I\'d have to apply this on a file, line by line. The line by line is OK, simple reading from

Answer 1

Another way to do

import re
[line for line in open('file.txt') if re.match(r'f\(\s*([^,]+)\s*,\s*([^,]+)\s*\)',line)]