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Regex for Hex Color Code

Matches 3 or 6 digit hex color codes.

The Pattern

/^#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/

javascript

const regex = /^#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/;
regex.test('#FFFFFF');

python

import re
regex = re.compile(r'^#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$')
bool(regex.match('#FFFFFF'))

import "regexp"
matched, _ := regexp.MatchString(`^#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$`, "#FFFFFF")

rust

use regex::Regex;
let re = Regex::new(r"^#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$").unwrap();
re.is_match("#FFFFFF")