Regex Tester - Test Regular Expressions Online
Test JavaScript regular expressions, view matches and perform replacements instantly.
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What is Regex Tester?
Regex Tester is a free tool to experiment with JavaScript regular expressions, inspect matches, capture groups, and preview replacements.
- Quickly test regex patterns with flags
- Inspect multiple matches and capture groups
- Perform replacements with support for group references
- All processing happens in your browser
🎥 Video Guide
❓ FAQs
What is a regex tester?
A regex tester lets you input a regular expression and a test string to quickly see matches, capture groups, and replacement results.
Are my strings uploaded to a server?
No. All regex processing happens locally in your browser for privacy.
Which regex flavor is used?
This tool uses JavaScript RegExp (ECMAScript) with standard JS flags like g, i, m, s, u, y.