Python Code to Validate an Email Address

Many programs ask for an email address, like a sign up or a contact form. Before saving it, you should check that it looks like a real email. In Python this is easy with the re module (regular expressions).

Python function to validate an email

import re

pattern = r"^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}$"

def is_valid_email(email):
    return re.match(pattern, email) is not None

tests = [
    "robin@example.com",
    "robin@example",
    "robin.kumar+test@mail.co.in",
    "robin@@example.com",
    "@example.com",
]

for email in tests:
    print(email, "->", is_valid_email(email))

Output:

How the pattern works

Part	Meaning
^ and $	Match the whole text, from the start to the end
[A-Za-z0-9._%+-]+	One or more letters, digits or these symbols before the @
@	Exactly one @ sign
[A-Za-z0-9.-]+	The domain name, like example or mail.co
\.[A-Za-z]{2,}	A dot and an ending of at least 2 letters, like .com or .in

Related: Python Modules, Python Strings.

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