Python match pattern to rename file

Question

I have couple of files with like this, llm_rc_v3212.xml, llm_ds_v3232.xml. Names can be anything. however, common parameter would be_v3212. I want to match this number and replace it (ideally renaming the file).

How can i match this pattern with regex? I am trying to use re.sub, but not able to figure yet.

any help would be appreciated.

Indeed, but it will work with the given examples. If the filenames can take another form @tgcloud please provide those. — Paco H., Sep 18 '17 at 13:21
@PacoH.: I have couple of files with `llm_v232_uc.xml` pattern. — tgcloud, Sep 18 '17 at 13:25

score 1 · Accepted Answer · answered Sep 18 '17 at 13:28

Here is a working example. Take into account that depending on other filenames the regex might need to be changed.

import re

FILENAME_VERSION_REGEX = re.compile(r'_v(\d)+')


def rename(filename, replacement):
    full_replacement = r'_v{}'.format(replacement)
    new_filename = FILENAME_VERSION_REGEX.sub(full_replacement, filename)
    return new_filename

Tested with the filenames you gave:

>>> rename('llm_rc_v3212.xml', 1)
'llm_rc_v1.xml'

>>> rename('llm_ds_v3232.xml', 2)
'llm_ds_v2.xml'

>>> rename('llm_v232_uc.xml', 3)
'llm_v3_uc.xml'

Thanks for Clear Explanation.! I am newbie ..! – tgcloud Sep 18 '17 at 13:35 — tgcloud, Sep 18 '17 at 13:35

Python match pattern to rename file

1 Answers1