I have a file ,and i need to delete the regex matching part and write remaining lines to a file.

Regex matching Code to delete file:

import re
with open("in1.txt") as f:lines = f.read()m = re.findall(r'(?s)(my _car_\s*.*?)my', lines)

Input file:

my _car_(10)skodaaudimy homegoodmy _car_(11)benz

Expected output:

my homegood

Please help me to fix it,answers will be appreciated!

Assuming you are able to write the lines out, this regex replacement may be what you're looking for

lines = re.sub(r'(?s)(my _car_\s*.*?)(my|$)', r'\2', lines).strip()

It sounds like you don't know how to write out to a file. To dump the text to a file called out.txt:

with open('out.txt', 'w') as f:f.write(lines)