I can't understand re.sub

Newsgroups	comp.lang.python
Date	2015-11-29 13:36 -0800
Message-ID	<af27abe4-f81e-4d44-a504-c58d9e71986a@googlegroups.com> (permalink)
Subject	I can't understand re.sub
From	Mr Zaug <matthew.herzog@gmail.com>

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I need to use re.sub to replace strings in a text file. I can't seem to understand how to use the re module to this end.

result = re.sub(pattern, repl, string, count=0, flags=0);

I think I understand that pattern is the regex I'm searching for and repl is the thing I want to substitute for whatever pattern finds but what is string?

The items I'm searching for are few and they do not change. They are "CONTENT_PATH", "ENV" and "NNN". These appear on a few lines in a template file. They do not appear together on any line and they only appear once on each line.

This should be simple, right?

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I can't understand re.sub Mr Zaug <matthew.herzog@gmail.com> - 2015-11-29 13:36 -0800
  Re: I can't understand re.sub Denis McMahon <denismfmcmahon@gmail.com> - 2015-11-29 22:01 +0000
    Re: I can't understand re.sub Mr Zaug <matthew.herzog@gmail.com> - 2015-11-29 17:20 -0800
  Re: I can't understand re.sub Rick Johnson <rantingrickjohnson@gmail.com> - 2015-11-29 17:12 -0800
    Re: I can't understand re.sub Mr Zaug <matthew.herzog@gmail.com> - 2015-11-29 17:24 -0800
  Re: I can't understand re.sub Erik <python@lucidity.plus.com> - 2015-11-29 21:53 +0000
    Re: I can't understand re.sub Jussi Piitulainen <harvesting@is.invalid> - 2015-11-30 10:51 +0200
      Re: I can't understand re.sub Erik <python@lucidity.plus.com> - 2015-12-01 01:26 +0000
        Re: I can't understand re.sub Jussi Piitulainen <harvesting@is.invalid> - 2015-12-01 07:28 +0200
          Re: I can't understand re.sub Erik <python@lucidity.plus.com> - 2015-12-01 21:31 +0000

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