Extract email sub-strings from large document

Question

I have a very large .txt file with hundreds of thousands of email addresses scattered throughout. They all take the format:

......
         


        

Answer 1

import re

reg_pat = r'\S+@\S+\.\S+'

test_text = 'xyz.byc@cfg-jj.com    ir_er@cu.co.kl   uiufubvcbuw bvkw  ko@com    m@urice'   

emails = re.findall(reg_pat ,test_text,re.IGNORECASE)
print(emails)

Output:

['xyz.byc@cfg-jj.com', 'ir_er@cu.co.kl']