What is Regex Tester
The Regex Tester evaluates regular expressions against test strings in real time, showing all matches with positions, capture groups, named groups, and match indices. Supports the full JavaScript regex syntax.
How to Use Regex Tester
- Step 1: Paste your input text into the textarea.
- Step 2: Configure the available options in the toolbar.
- Step 3: Click Transform to process the input.
- Step 4: The result appears in the output panel. Copy it using the copy button.
Why Use Regex Tester
Regex Tester saves time by automating a common regex task that would otherwise require manual effort, custom scripts, or tooling setup. Running entirely in your browser, it processes data instantly without network latency, upload concerns, or account requirements. Your data stays completely private on your device.
Privacy & Security
This tool runs entirely in your browser — no data ever leaves your device. There is no server round-trip, no upload, no logging, and no account required. Your input is processed locally using client-side JavaScript and is never stored, transmitted, or accessible to anyone else. When you close the tab, everything disappears.
Frequently Asked Questions
How does Regex Tester handle my data?
<p>The tool processes your input entirely in your browser using JavaScript. No data is sent to any server or stored beyond the current session. Everything is ephemeral.</p>
What input formats are accepted?
<p>The tool accepts text input pasted into the textarea. It processes the text and displays the result in the output panel.</p>
Is there a usage limit?
<p>No. The tool runs entirely in your browser with no rate limiting, quotas, or account requirements. Use it as often as needed.</p>