Regex Tester
Write and debug regular expressions in real-time with capture group inspection.
/
/
Enter a valid regex and test string above...
How to Use Regex Tester
- Enter your regular expression pattern in the regex input field.
- Toggle regex flags (Global 'g', Case Insensitive 'i', Multiline 'm', DotAll 's').
- Type or paste your test text in the test string area.
- Inspect matched substrings, capture groups, and match counts in the live results panel.
Key Features & Privacy Guarantee
- Live Highlighting: Matched characters and groups are highlighted in real-time.
- Capture Group Inspector: Detailed breakdown of each match index and capture groups.
- Common Pattern Library: Pre-built quick regex snippets for emails, URLs, dates, and phone numbers.
Frequently Asked Questions
Which Regex engine is used?
The tester uses JavaScript's ECMAScript Regular Expression engine running client-side.