/.*

Regex Tester

Test regular expressions with live match highlighting.

Developer GeneratorsBrowser-only • PrivateFree

Regular Expression

//g

Test String

Matches (2)

Match 1: "hello@codeutilitykit.com"

Match 2: "support@example.org"

Privacy First: All processing happens locally in your browser. Your data never leaves your device and is never uploaded to any server.

About Regex Tester

The Regex Tester runs your regular expression against sample text and highlights every match live, showing capture groups and honoring flags like global, case-insensitive, and multiline. It's the fastest way to build and debug a pattern without a script. Everything runs in your browser with nothing uploaded. Need a ready-made pattern? Use the Regex Generator, and apply your regex with the Find and Replace tool.

How to Use

1Open Regex Tester and paste or type your data into the input area.
2Adjust any available options to match the result you want.
3Your output is generated instantly — no button-clicking required for most tools.
4Use the Copy or Download button to save your result.

Common Use Cases

Generating test data, IDs, and placeholder content
Creating secure passwords, API keys, and secrets
Testing and building regular expressions
Generating SEO files like robots.txt and sitemaps

Frequently Asked Questions

Which regex flags are supported?

Common flags including global, case-insensitive, multiline, and dot-all are supported, and matches update live as you type so you can see the effect of each flag immediately.

Does it show capture groups?

Yes. Each match is broken out with its capture groups, so you can confirm your parentheses capture exactly the parts of the text you intend.

Is Regex Tester free to use?

Yes. Regex Tester is completely free with no sign-up, no subscription, and no usage limits. Every tool on CodeUtilityKit is free forever.

Is my data safe when I use Regex Tester?

Absolutely. Regex Tester runs entirely in your browser. Your input is processed locally with JavaScript and is never sent to, stored on, or logged by any server — so it is safe even for private or sensitive data.