Regex for Matching a Hex Color Code

Matches 3-digit or 6-digit hex color codes prefixed with #.

Key points

• Matches both shorthand (#fff) and full (#ffffff) hex notation
• Case-insensitive matching is often needed since hex digits can be upper or lowercase

Example

^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$