Regex for credit card number

Note

Finds 13–19 digit runs with optional spaces or dashes. Whether a number is real is a Luhn checksum, not a regex.

Matches in the example

• "4111 1111 1111 1111"
• "5500-0000-0000-0004"

Token by token

1. \b a word boundary
2. (?: a group, not capturing
3. \d a digit (0–9)
4. [ -]? one of: a space or “-”, optionally
5. ){12,18} end of group, whole group between 12 and 18 times, as many as possible
6. \d a digit (0–9)
7. \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