How to regex match list of patterns in python

Question

I have list of patterns and I need to return that pattern if that is present in the given string else return None. I tried with the below code using re module , but I am getting only null in "matches" (when I tried to print matches). Completely new to corepython and regex,kindly help

import re
patterns_lst=['10_TEST_Comments','10_TEST_Posts','10_TEST_Likes']

def get_matching pattern(filename):
   for pattern in patterns_lst:
     matches = re.(pattern,filename)
   if matches:
      return matches
   else:
      return None

print(get_matching pattern("6179504_10_TEST_Comments_22-Nov-2021_22-Nov-2021.xlsx"))

This isnt even valid python. Is this a homework excercise where you have been given some code and you are meant to fix the code and make it work? — Chris Doyle
– Chris Doyle, Commented Dec 24, 2021 at 9:56
I will happy to help you if you provide code that I could run (and is similar enough to this one) ;) — kosciej16
– kosciej16, Commented Dec 24, 2021 at 9:57
@ChrisDoyle definitely this not home work code , I have to pull the report of names from a SFTP server and re-name it accordingly with the matching pattern and sent it via DRF response . The files patterns are almost same , here i just replaced the original file names with "sample" and "test" — massu1000
– massu1000, Commented Dec 24, 2021 at 10:04
@SivaPerumal Your code doesn't run, it has various syntax errors. — norie
– norie, Commented Dec 24, 2021 at 10:06

jacob · Accepted Answer · 2021-12-24 10:19:01Z

1

I have made some changes to your function:

def get_matching_pattern(filename):            ## Function name changed
    for pattern in patterns_lst:
        match = re.search(pattern, filename)   ## Use re.search method

        if match:                              ## Correct the indentation of if condition
            return match                       ## You also don't need an else statement

Output:

>>> print(get_matching_pattern("6179504_10_TEST_Comments_22-Nov-2021_22-Nov-2021.xlsx"))
<re.Match object; span=(8, 24), match='10_TEST_Comments'>

answered Dec 24, 2021 at 10:19

jacob

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