Regex for time (24-hour)

Note

Requires two-digit hours. Allow 9:05 by changing [01]\d to [01]?\d.

Matches in the example

• "09:00"
• "17:30:15"

Token by token

1. \b a word boundary
2. (?: a group, not capturing
3. [01] one of: “0” or “1”
4. \d a digit (0–9)
5. | or
6. 2 the character “2”
7. [0-3] one of: “0” to “3”
8. ) end of group
9. : the character “:”
10. [0-5] one of: “0” to “5”
11. \d a digit (0–9)
12. (?: a group, not capturing
13. : the character “:”
14. [0-5] one of: “0” to “5”
15. \d a digit (0–9)
16. )? end of group, whole group optionally
17. \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