Valid Hex Code

Challenge Difficulty: Medium | Estimated completion time: ~15 minutes

Create a function that determines whether a string is a valid hex code.

A hex code must begin with a pound key # and is exactly 6 characters in length.

Each character must be a digit from 0-9 or an alphabetic character from A-F. All alphabetic characters may be uppercase or lowercase.

Examples

is_valid_hex_code("#CD5C5C")
output = True
 
is_valid_hex_code("#EAECEE")
output = True
 
is_valid_hex_code("#eaecee")
output = True
 
is_valid_hex_code("#CD5C58C")
output = False
# Length exceeds 6
 
is_valid_hex_code("#CD5C5Z")
output = False
# Not all alphabetic characters in A-F
 
is_valid_hex_code("#CD5C&C")
output = False
# Contains unacceptable character
 
is_valid_hex_code("CD5C5C")
output = False
# Missing #

Solution

Python

import re def is_valid_hex_code(code: str) -> bool: """Check if string is a valid hex color code. Args: code: String to validate Returns: True if valid hex code, False otherwise """ pattern = r"^#[0-9A-Fa-f]{6}$" return bool(re.match(pattern, code)) if __name__ == "__main__": print(is_valid_hex_code("#CD5C5C")) # True print(is_valid_hex_code("#EAECEE")) # True print(is_valid_hex_code("#eaecee")) # True print(is_valid_hex_code("#CD5C58C")) # False print(is_valid_hex_code("#CD5C5Z")) # False print(is_valid_hex_code("#CD5C&C")) # False print(is_valid_hex_code("CD5C5C")) # False

Output