[Code Example] Check if string is color hex code in bash


In this article we will provide you bash script code to check if string is a hex code of a color. A color hex code starts with # followed by 3 or 6 hexadecimal numbers 0-9A-F.

Code Example –


is_hex_color() {
    [[ $1 =~ ^(#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3}))$ ]] && echo "${BASH_REMATCH[1]}"

# This color code is wrong. 4 characters

# regex validation will fail so color will get RED value
is_hex_color "$color" || color="RED"

echo $color # output = RED

second_color="#FFF" # Correct color hex
is_hex_color "$second_color" || second_color="RED"
echo $second_color # output = "#FFF"

Inspired from Dylan Araps

Live Demo

Demo might not work in private window (incognito)

Sign Up for Our Newsletters

Get only the best articles delivered to your mail

You May Also Like