Free Regular Expression Tester

Yes, the 正規表現テスター on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.

リアルタイムハイライトで正規表現をテスト・デバッグします。 No data is sent to a server — everything runs locally in your browser for maximum privacy and speed.

No installation needed. The 正規表現テスター runs entirely in your web browser on any device — desktop, tablet, or mobile.

Completely safe. The 正規表現テスター processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.

After the page loads for the first time, the 正規表現テスター works without an internet connection for all client-side processing. Tools that fetch live external data (such as DNS or WHOIS lookups) require an active connection.

Yes. The 正規表現テスター is a utility tool and its output carries no licensing restrictions. You are free to use results in any project, commercial or personal.