Regex Generator
Build a regular expression without assembling every token by hand. Choose a common pattern, adjust flags and options, then copy the generated expression for use in JavaScript, forms, logs, and validation code.
Local Processing
Your tool input is processed locally in your browser and is not sent to DevToolsLabs servers.
Email Address
Matches standard email addresses (e.g., user@example.com)
How to use this tool
- Choose the type of text or value you want to match.
- Adjust the available pattern settings and regular-expression flags.
- Review the generated expression and copy it into your application.
- Test it against representative valid and invalid inputs before production use.
Example Usage
Match a basic email address
/^[^\s@]+@[^\s@]+\.[^\s@]+$/i
When to use this tool
- Creating client-side validation patterns for forms.
- Generating starter expressions for log parsing and data cleanup.
- Learning how flags and common regex tokens affect a pattern.
Frequently Asked Questions
Does the generator send my text to a server?
No. Pattern generation runs locally in your browser.
Should generated regexes be tested?
Yes. Always test a pattern with realistic positive, negative, and edge-case inputs before relying on it.
Built by Developers, For Developers
DevToolsLabs is maintained as an open-source collection of focused developer utilities. Most transformations run locally in your browser; tools that require a network service disclose the destination beside the tool. Each utility is built around a concrete development workflow and can be reviewed in the public source repository.