Character classes
- \d
- Digit
- \w
- Word character
- \s
- Whitespace
- [^abc]
- Not a, b, or c
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Regex Cheatsheet
Reference common JavaScript regex syntax.
Scan common character classes, quantifiers, anchors, groups, and starter patterns.
- Mode
- Guide
- Engine
- JS
- Status
- Live
Quantifiers
- *
- Zero or more
- +
- One or more
- ?
- Zero or one
- {2,5}
- Between 2 and 5
Anchors and groups
- ^
- Start of input or line
- $
- End of input or line
- (abc)
- Capture group
- (?:abc)
- Non-capturing group
Useful patterns
- \b\w+@\w+\.\w+\b
- Simple email shape
- https?:\/\/\S+
- HTTP URL
- \b[0-9a-f]{8}\b
- 8-char hex fragment
- ^\s*$
- Blank line