→ Regex Tester lets you test and debug regular expressions instantly in your browser — free, no sign-up, no file uploads to servers.
Use our free Regex Tester to test and debug regular expressions. Works instantly in your browser — no downloads, no registration, no data uploaded.
The Regex Tester lets you write, test, and debug regular expressions against sample text in real time — showing matches highlighted as you type, with capture group values, match counts, and flag options all visible simultaneously. Writing regular expressions without immediate feedback leads to hours of trial-and-error debugging; this tool collapses that cycle to seconds. WebSurfTools' free Regex Tester runs in your browser with no account required and nothing sent to any server.
Lightning-Fast Processing
The Regex Tester runs directly in your browser, delivering results in seconds with no server round-trips.
Zero Data Retention
Your files and data are processed locally and never stored, logged, or sent to any external server.
Completely Free Forever
Use the Regex Tester as many times as you need — no subscription, no usage caps, no credit card required.
Syntax-Aware Processing
Intelligent code-aware output ensures clean, valid results for every language and data format.
Paste your input
Paste your code, data, or content into the input field. Large inputs are fully supported — there is no size limit.
Process it
Click the format, encode, or generate button. The transformation runs instantly in your browser with nothing sent to a server.
Copy or download the output
Use the Copy button for clipboard access, or download as a file. The result is ready to use immediately.
Regex Tester runs entirely in your browser — no server needed, no uploads, instant results every time.
Files and inputs are processed in memory and never stored, logged, or sent to any external server.
Use the Regex Tester as many times as you need — no daily limits, no rate throttling, no paywalls.
Output is always clean, formatted, and ready to paste directly into your codebase or terminal.
Use the Regex Tester to test and debug regular expressions quickly, without relying on expensive desktop software or IT support.
The Regex Tester makes it easy to test and debug regular expressions on demand, saving hours that would otherwise be spent on manual work or paid tools.
Rely on the Regex Tester to get accurate, professional-quality results instantly — no account, no software, no waiting.
| Feature | WebSurfTools | Alternative |
|---|---|---|
| Cost | ✓ Free forever | ✗ Free tier (regex101, cloud-evaluated) |
| Privacy | ✓ Patterns and strings stay local | ✗ Patterns sent to regex101 servers |
| Speed | ✓ Instant local evaluation | ✗ Server round-trip for each evaluation |
| Sign-up | ✓ No account required | ✗ Account required to save patterns |
WebSurfTools gives you professional results without the price tag.
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Always validate generated code or data in a staging environment before using in production. Browser tools process client-side data correctly but can't catch logic errors.
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The one-click copy button captures the full output including trailing newlines — manual text selection often misses the last character.
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Never paste production API keys, passwords, or PII into any online tool on a shared computer. Clear the input field after use.
Yes — free, no sign-up, no limits. Test as many patterns as you need. We also offer JSON Formatter for formatting data you're extracting with regex.
All regex evaluation runs locally in your browser — your test strings are never sent to any server. Log data, emails, and personal content stay on your device.
JavaScript regex (ECMA-262) is used, which covers the vast majority of modern use cases. Flags including g (global), i (case-insensitive), m (multiline), and s (dotall) are all supported.
Yes — capture group values are shown individually for each match. Named groups (?<name>...) are displayed by name. Use Diff Checker to compare regex results from different pattern versions.
Yes — the tester detects patterns that may cause catastrophic backtracking on certain inputs and warns before execution times out.
regex101 is an excellent tool that sends your patterns to their servers for evaluation. WebSurfTools Regex Tester runs entirely in your browser, keeping log data and sensitive test strings local.
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