How to use Email Regex Tester
- Start by adding the pattern and test string you want to check into Email Regex Tester.
- Use the Email preset setting to control the result.
- Watch the output update instantly while you adjust the pattern and test string.
- Use Copy to keep or reuse the result.
About this tool
Email Regex Tester is a static, client-side tool with no backend. Email Regex Tester lets you check email strings against a regex locally, so you can see matches and refine the pattern.
Everything runs on your device; Email Regex Tester does not contact any server. It behaves the same on desktop and mobile, with nothing stored remotely.
Frequently asked questions
What does Email Regex Tester do?
Email Regex Tester lets you check your input right in the browser using the Email preset control, with the result shown instantly and nothing uploaded.
Is Email Regex Tester free to use?
Yes — Email Regex Tester is completely free, with no usage limits.
Is my input private in Email Regex Tester?
Yes — your input never leaves your device; Email Regex Tester does all the work in your browser.
Does Email Regex Tester check whether the domain exists?
No — Email Regex Tester only matches an address against a regular expression in your browser. It makes no network lookups; it just tests the format.
Can I use Email Regex Tester without a connection?
Yes — after the first load Email Regex Tester runs entirely offline.