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Regex Pattern Builder
Compose regular expressions with guided toggles for character sets, anchors, quantifiers, and flags. Test against sample input instantly.
How to use this tool
- Choose the character classes and symbols you want to allow in the pattern.
- Configure anchors, quantifier mode, and regex flags to match your intended behavior.
- Validate against sample input and review highlighted matches in real time.
Common presets
- Slug validation: lowercase + digits + hyphen with start/end anchors.
- Invoice formats: uppercase + digits with exact or ranged quantifiers.
- Flexible tokens: add custom symbols while keeping explicit character control.
Safety and quality notes
- Escape user-provided input before building dynamic runtime regexes.
- Anchor patterns when full-string validation is required.
- Test edge cases to avoid over-matching in production workflows.
FAQ
- Can I include custom characters?
- Yes. Add them in the custom field and they are escaped for character-class safety.
- Does this support multiline matching?
- Yes. Toggle the multiline flag to change anchor behavior across lines.
- Can I build Unicode-aware patterns?
- You can include Unicode ranges or escapes manually in the custom characters field.
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