Regex Tester
Test regular expressions with live matching, highlighting, and capture groups.
Free Web vs Desktop App
Web (Free)
- +Regex Tester with basic functionality
- +No signup or account required
- +Works in any modern browser
- -Up to 2 KB input on the web
- -Single tool per page, no integrations
Desktop App ($29 one-time)
- Unlimited size, integrated with code editor find-and-replace
- All 16 developer utilities in one ToolBox
- Plus terminal, HTTP client, database client, Docker manager
- AI agents, code editor, Git client, and 100+ more features
- macOS, Windows, Linux — one-time purchase, own forever
About Regex Tester
Write a regex pattern and test it against your text in real time. See all matches highlighted, view capture groups, and toggle flags (global, case-insensitive, multiline). Essential for building and debugging regex patterns for validation, parsing, and search.
Frequently Asked Questions
Is Regex Tester free to use?
Yes! This online version is completely free with no signup required. Up to 2 KB input on the web. For unlimited usage and full integration with 100+ developer tools, download the 1DevTool desktop app ($29 one-time).
Is my data safe?
Absolutely. All processing happens entirely in your browser. Your data never leaves your machine — nothing is sent to any server. The tool runs 100% client-side using JavaScript.
What do I get with the desktop app?
The desktop app includes Regex Tester with no limits, plus 15 other developer utilities. Beyond the ToolBox, you get multi-agent AI terminals, HTTP client, database client (26 engines), Docker manager, Git client, code editor, browser preview, and more — all in one workspace. $29 one-time, no subscription.
Like this tool? There's a lot more.
Download 1DevTool to get Regex Tester with no limits, plus 15 other utilities, AI terminals, HTTP client, database client, and 100+ features.