Question

What I need is to parce my projects’ resource files and change its version number. I have a working JS script but I would like to implement it with python.

So, the problem stands in using re.sub:

version = "2,3,4,5"
modified_str = re.sub(r"(/FILEVERSION )\d+,\d+,\d+,\d+(\s)/g", version, str_text)

I understand that because of using capturing groups my code is incorrect. And I tried to do smth like:

modified_str = re.sub(r"(/FILEVERSION )(\d+,\d+,\d+,\d+)(\s)/g", r"2,3,4,5\2", str_text)

And still no effect. Please help!

Answer 1

That’s not the way to make multiline regexes in python. You have to compile the regex with the MULTILINE flag:

regex = re.compile(r"\bFILEVERSION \d+,\d+,\d+,\d+\b", re.MULTILINE)

Also, since you’re using re.sub(), the FILEVERSION part of your string will disappear if you don’t specify it again in the replacement string:

version = "FILEVERSION 2,3,4,5"
modified_str = re.sub(regex, version, str_text)

To match other things than FILEVERSION, introduce a capture group with an alternation:

regex = re.compile(r"\b(FILEVERSION|FileVersion|PRODUCTVERSION|ProductVersion) \d+,\d+,\d+,\d+\b", re.MULTILINE)

Then you can inject the captured expression into the replacement string using the backreference \1:

version = r"\1 2,3,4,5"
modified_str = re.sub(regex, version, str_text)