Regex for number

Note

Integers, decimals and scientific notation. Thousands separators like 1,000 are two numbers here.

Matches in the example

• "42"
• "-7"
• "3.14"
• "6.02e23"
• "-1.5E-3"

Token by token

1. -? the character “-”, optionally
2. \b a word boundary
3. \d+ a digit (0–9), one or more times, as many as possible
4. (?: a group, not capturing
5. \. the character “.”
6. \d+ a digit (0–9), one or more times, as many as possible
7. )? end of group, whole group optionally
8. (?: a group, not capturing
9. [eE] one of: “e” or “E”
10. [+-]? one of: “+” or “-”, optionally
11. \d+ a digit (0–9), one or more times, as many as possible
12. )? end of group, whole group optionally
13. \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