Devtools

Regex Builder

Build regular expressions from simple options without having to write regex syntax yourself.

100% Private

Files never leave browser

Fast Processing

Batch convert in seconds

High Quality

100% accurate output

Test patterns.Live matches.

REGEX

MATCH

Input & Settings

Pattern Type

Example

hello@example.com

Test String

Browser only

Your patterns and test data stay in your browser. Nothing is uploaded.

Preview & Workspace

Generated Regex

Your regex updates automatically as you change the options.

Generated Pattern

/^[\w.-]+@[\w.-]+\.[A-Za-z]{2,}$/i

Matches a basic email address such as hello@example.com.

Ready to test

Enter a test string in the sidebar to see whether it matches your generated regex.

About Regex Builder

Instant client-side syntax parsing and data validation

Zero network transmission for complete privacy

Formatted output with syntax highlighting and instant copy

Offline ready with automatic local state retention