Regex for hex color

Note

Accepts 3, 4, 6 and 8 digits: the short and long forms, with and without alpha.

Matches in the example

• "#fff"
• "#1e90ff"
• "#0008"
• "#11223344"

Token by token

1. # the character “#”
2. (?: a group, not capturing
3. [0-9a-f]{3,4} one of: “0” to “9” or “a” to “f”, between 3 and 4 times, as many as possible
4. | or
5. [0-9a-f]{6} one of: “0” to “9” or “a” to “f”, exactly 6 times
6. | or
7. [0-9a-f]{8} one of: “0” to “9” or “a” to “f”, exactly 8 times
8. ) end of group
9. \b a word boundary

Other patterns

• Email address
• URL
• IPv4 address
• UUID
• Hex color
• Date (YYYY-MM-DD)
• Time (24-hour)
• US phone number
• Phone number (E.164)
• US ZIP code
• Credit card number
• URL slug
• Username
• Strong password
• HTML tag
• Semantic version
• MAC address
• JSON Web Token
• Hashtag
• @mention
• Number
• Leading and trailing whitespace
• Repeated word
• Blank lines
• Markdown link
• Quoted string
• Domain name
• File extension
• Base64
• Trailing comma