Match exact string and print the line

Question

I want to check if a string is matching a substring in a line after 3rd occurrence of delimiter

mapping_name = reversed

delimiter = #

Contents of test_file.txt

1#ABC#test#reversed_once#gm#999
2#WBC#test_1#reversed_first#gm#9998
3#TBC#tested#reversed_last#gm#9998
4#CBC#test#reversed_reversed#gm#999
5#ZBC#test#reversed#gm#9990

I have done like below

wf_string = []
batch_file = open("/home/tester/test_file.txt", 'r')

for lines in batch_file:
    if mapping_name in lines:
        print(lines)
        wf_string.append(lines)

But it is printing lines 4 and 5 . Ideally it should print only the 5th line

Answer 1

Try something like the below ( Note that the code assume that you want to natch against fourth field only)

match = 'reversed'
with open('in.txt') as f:
  for idx,line in enumerate(f,1):
    if match == line.split('#')[3]:
      print(f'match in line {idx}')

output

match in line 5