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1. Reverse a String2. Check Palindrome String3. Count Vowels in String4. Count Consonants in String5. Count Digits in String6. Remove Special Characters7. Remove Whitespace8. Find Substring9. Replace Substring10. Character Frequency11. Capitalize First Letter of Each Word12. Convert String to Title Case13. Sort String Characters14. Find Longest Word15. Find Shortest Word16. String Compression17. String Rotation18. Anagram Check19. Split and Join Strings20. Count Words in String21. Extract Numbers from String22. Validate Email Using Regex23. Validate Phone Number Using Regex24. Check Pangram25. Convert snake_case to camelCase

Validate Email Using Regex in Python

A toy regex. It accepts test@example.com. It also accepts garbage that looks vaguely like an email.

IntermediateString ProgramsExample 22 of 25
validate-email-using-regex.py
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1# Program to validate email using regex
2

3import re
4

5email = input("Enter email: ")
6

7pattern = r"^[\w\.-]+@[\w\.-]+\.\w+$"
8

9if re.match(pattern, email):
10    print("Valid email")
11else:
12    print("Invalid email")

Output

Enter email: test@example.com
Valid email

What's going on

re.match from the start of the string. Pattern is roughly: stuff @ stuff . stuff.

Real email validation is a tar pit. This one fails a@b (no dot in the domain) and lets through a@b.c which is not a mailbox. Fine for a class exercise. Do not ship it.

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