How to catch string between two strings

[SriMekala]

Hi,

I have below code to catch a string between two strings using a code as below:

I want to catch a string between '.csv' & _ just before .csv. Desired output is: JCET01, but using below code is giving the out I desired.

import re

filename='input_file_JCET01.csv'

result = re.search('_(.*).csv', filename)

[heiner55]

#! /usr/bin/python3
import re
filename='input_file_JCET01.csv'
result = re.search('file_(.*).csv', filename)
print(result.group(1))

[perfringo]

Another way, without re:

>>> filename.rsplit('_', maxsplit=1)      # split on underscore from right one time                                     
['input_file', 'JCET01.csv']
>>> filename.rsplit('_', maxsplit=1)[1]   # select second element                                    
>>> 'JCET01.csv'
>>> filename.rsplit('_', maxsplit=1)[1].split('.')     # split element on period                     
['JCET01', 'csv']
>>> filename.rsplit('_', maxsplit=1)[1].split('.')[0]  # select first element                  
'JCET01'

[heiner55]

The solution of perfrigon is easier to understand.