Python One-Liner: Validate an Email Address with Regex! ✉️✔️ #PythonTips #CodingShorts

Email validation is a common task for form processing, data cleaning, and user-input verification.

Regex Pattern:

^[\w\.\+\-]+ → One or more word characters, dots, pluses or hyphens before the @.

@[\w\-]+ → An @ followed by one or more word characters or hyphens.

\.[a-zA-Z]{2,}$ → A dot and 2+ letters at the end.

Long Way:

Import the re module.

Loop over example emails, printing each alongside its validity.

One-Liner:

Ideal for quick checks in scripts or interactive sessions.

This one-liner runs in O(n) time where n is the length of the email string and covers most common email formats—perfect for form validation or preprocessing in Jupyter notebooks!

Codes:

# Long Way: Define and use an email-validation function
import re

def is_valid_email(email):
"""
Returns True if the email matches a basic RFC-style regex,
else False.
"""
pattern = r'^[\w\.\+\-]+@[\w\-]+\.[a-zA-Z]{2,}$'

# Example usage:
for e in tests:
print(e, is_valid_email(e))
# Output:

# One-Liner: Inline regex fullmatch
import re
# Output: True