Free Online RegEx Tester
Test your regular expressions against a sample text and see the matches highlighted directly on the text, updating in real time as you type the pattern. Supports all standard JavaScript flags (g, i, m, s, u, y, d) and shows the total number of matches found.
💡 Advantages of using RegEx Tester
- • Highlights matches directly on the test text
- • Supports all JavaScript regex flags (g, i, m, s, u, y, d)
- • Real-time updates as you type the pattern
- • Shows the total number of matches found
- • Free, with no usage limit
🧪 RegEx Tester
Test regular expressions with match highlighting
Test RegExp patterns in real time. Matches are highlighted.
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⚡ Cómo usar en 3 pasos
- 1
Type your regex
Enter the pattern and the flags you want to use.
- 2
Paste the test text
Enter the text you want to test the expression against.
- 3
Check the matches
Review the highlighted matches and the total count.
Frequently Asked Questions about RegEx Tester
What regex flags does it support?▼
g (global), i (case-insensitive), m (multiline), s (dot matches newline), u (unicode), y (sticky) and d (indices).
How do I know if my pattern has an error?▼
If the pattern is invalid, the tool indicates it and shows no matches until you fix the expression.
Do matches update as I type?▼
Yes, both the pattern and the test text are evaluated in real time, with no button to press.
Can I use it to test regex before using it in my code?▼
Yes, since it uses JavaScript's native regular expression engine, the behavior is the same as it will be in your code.
Is RegEx Tester free?▼
Yes, RegEx Tester from WebTools is 100% free. No registration or subscription required. You can use it as many times as you need at no cost.
Is it safe to use RegEx Tester online?▼
Yes, all information is processed directly in your browser. We do not store or send your data to any external server.
Does RegEx Tester work on mobile?▼
Yes, the tool is fully responsive and works on any device: phone, tablet or computer with a modern browser.