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Regex Tester
Validate regex patterns, inspect capture groups, and confirm match scope with highlighted preview.
Output
Ready
Highlighted preview
Matches
0
Capture groups
0
Flags
g
When to use this tool
Use regex testing when validating extraction patterns, migration scripts, or text normalization rules.
Capture groups and index data help verify precise matching behavior before code changes.
Frequently asked questions
Does this regex tester support JavaScript regex flags?
Yes. You can toggle common flags such as global, case-insensitive, multiline, dotAll, unicode, and sticky.
Can I inspect capture groups?
Yes. Each match result includes the match index and any capture group values.
Does this tool highlight matches in text?
Yes. The preview panel highlights matched segments so you can verify pattern scope quickly.
Related tools
Regex tester online for JavaScript pattern and capture-group debugging
Use this regex tester online to validate JavaScript patterns, inspect capture groups, and confirm exact match boundaries before shipping code.
Live match highlighting makes it easier to debug extraction logic in migration scripts, log parsing, and form validation rules.
Common production use cases
- Test named capture groups in JavaScript regex patterns.
- Validate multiline matching in changelog and log inputs.
- Check global vs sticky behavior before implementation.
- Copy match reports into PR descriptions and bug tickets.