Generate an email regex
Input
Template: Email, test text: hello@51tools.infoOutput
/^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}$/Regex Generator
Generate regular expressions from common templates such as email, URL, IP, date, and password.
Generate regular expressions from common templates or a custom builder. It covers email, URL, domain, IP, date, UUID, color, mobile number, and ID-style formats, with instant test text validation.
How to use
- Choose a common template, or switch to custom builder to set prefix, suffix, character set, and repeat counts.
- Select g, i, and m flags as needed, then enter test text.
- Review the match result, copy the regex or raw pattern, and use the regex tester for deeper validation.
Examples
Privacy
May contact server
Avoid sensitive data
Uploads only when needed
Template selection, custom building, and testing run entirely in your browser.
Frequently asked questions
Templates and custom builder output are good starting points, but you should test them against your business rules, locale, and input sources.
It can combine literal prefix and suffix text with digits, letters, Chinese characters, custom character sets, repeat counts, and whole-text matching.
This is a local generator and does not require AI or upload input. Natural-language generation can be added later as an optional feature.
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