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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 Phone Number Using Regex in Python

Validate a simple phone number format using regular expressions.

IntermediateString ProgramsExample 23 of 25
validate-phone-number-using-regex.py
1# Program to validate phone number using regex
2

3import re
4

5phone = input("Enter phone number: ")
6

7pattern = r"^\+?\d{10,15}$"
8

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

Output

Enter phone number: +911234567890
Valid phone number

What's going on

We allow an optional + followed by 10 to 15 digits to represent an international-style phone number.

After this program

If the idea is still fuzzy, read Day 4: Strings and String Methods in the Python course. For a short check, try the Python quiz (300 questions). Stay with all 25 string programs, or see every topic on Python exercises.

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