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']

Answer 2

import re
rgx = r'(?:\.?)([\w\-_+#~!$&\'\.]+(?<!\.)(@|[ ]?\(?[ ]?(at|AT)[ ]?\)?[ ]?)(?<!\.)[\w]+[\w\-\.]*\.[a-zA-Z-]{2,3})(?:[^\w])'
matches = re.findall(rgx, text)
get_first_group = lambda y: list(map(lambda x: x[0], y))
emails = get_first_group(matches)

Please don't hate me for having a go at this infamous regex. The regex works for a decent portion of email addresses shown below. I mostly used this as my basis for the valid chars in an email address.

Feel free to play around with it here

I also made a variation where the regex captures emails like name at example.com

(?:\.?)([\w\-_+#~!$&\'\.]+(?<!\.)(@|[ ]\(?[ ]?(at|AT)[ ]?\)?[ ])(?<!\.)[\w]+[\w\-\.]*\.[a-zA-Z-]{2,3})(?:[^\w])

Answer 3

Here's another approach for this specific problem, with a regex from emailregex.com:

text = "blabla <hello@world.com>><123@123.at> <huhu@fake> bla bla <myname@some-domain.pt>"

# 1. find all potential email addresses (note: < inside <> is a problem)
matches = re.findall('<\S+?>', text)  # ['<hello@world.com>', '<123@123.at>', '<huhu@fake>', '<myname@somedomain.edu>']

# 2. apply email regex pattern to string inside <>
emails = [ x[1:-1] for x in matches if re.match(r"(^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$)", x[1:-1]) ]
print emails   # ['hello@world.com', '123@123.at', 'myname@some-domain.pt']

Answer 4

import re
with open("file_name",'r') as f:
    s = f.read()
    result = re.findall(r'\S+@\S+',s)
    for r in result:
        print(r)

Answer 5

You can use \b at the end to get the correct email to define ending of the email.

The regex

[\w\.\-]+@[\w\-\.]+\b

Answer 6

You can also use the following to find all the email addresses in a text and print them in an array or each email on a separate line.

import re
line = "why people don't know what regex are? let me know asdfal2@als.com, Users1@gmail.de " \
       "Dariush@dasd-asasdsa.com.lo,Dariush.lastName@someDomain.com"
match = re.findall(r'[\w\.-]+@[\w\.-]+', line)
for i in match:
    print(i)

If you want to add it to a list just print the "match"

# this will print the list
    print(match)