This would treat each line of the provided file as an individual line, which would be used to parse the regex expressions and replace the matching ones. - This mode can run on hypertext and ...

How to use the regular expression functions provided by the ‘re’ library to match, search, and replace text in your Python programs. Regular expressions, or “regex,” is a system for finding complex ...

With this code you can convert regular expression given in the Python format to a (close) equivalent formal definition. For a quick guide on Python regex, see the official documentation.