Regex Tester

Test regular expressions online. Match, extract, and replace text using Javascript Regex.

Instant
100% Private
Free Forever
No Signup

Regular Expression

Test String

Highlighted Matches

No matches yet. Enter a regex and text above.

About This Regex Tester

Test regular expressions online. Match, extract, and replace text using Javascript Regex. This free regex tester is built for speed: open the page, complete your task, and copy or download the result.

Everything runs in your browser whenever possible, so your data stays private. No signup, no install, and no waiting for uploads or server queues — just open the tool and get the job done.

What You Can Do

Free regex tester with no signup required
Runs instantly in your browser
Private by design — your data stays on your device
Works on desktop and mobile
Clean, distraction-light interface for fast tasks
Related developer tools available on TinyToolbox

How to Use Regex Tester

1
Enter input
Paste or type your data into the Regex Tester.
2
Run the tool
Click the action button to process instantly.
3
Copy result
Copy the output and use it in your workflow.

Popular Use Cases

Everyday developer tools tasks without installing software
Quick one-off jobs when you need a result immediately
Private processing for sensitive or temporary data
Pair with JSON Validator and HTML Encoder / Decoder for a complete workflow

Example

Pattern: [a-z]+
Flags: g
Test String: Hello World 123

Matches:
- ello
- orld

Frequently Asked Questions

Is this regex tester free?

Yes. Regex Tester on TinyToolbox is free to use with no signup, no install, and no hidden paywall for core usage.

Is my data private when using Regex Tester?

Yes. Processing runs locally in your browser whenever possible. We do not require an account and we do not store the content you paste or upload for tool processing.

Do I need to create an account?

No. Every TinyToolbox utility is available instantly in your browser without registration.

Why use an online regex tester?

Test regular expressions online. Match, extract, and replace text using Javascript Regex. Online tools are useful when you want a fast result without installing desktop software.

Related tools you may need next

JSON Validator

Validate JSON data online. Catch syntax errors and verify JSON structure instantly.

Developer Tools

HTML Encoder / Decoder

Encode and decode HTML entities online. Convert special characters to HTML-safe strings.