PATTERN ENGINE

RegEx Tester

The most intuitive way to build, debug, and optimize regular expressions. Visual feedback, group extraction, and instant code export.

Expression
//g
Test Strings
key1="value1" key2="value2" status=active
Match Results (0)
No matches found for the current pattern.

Mastering Patterns

Regular Expressions are the Swiss Army knife of text processing. From validating emails to parsing complex server logs, a well-crafted RegEx can replace hundreds of lines of manual looping logic.

This tool uses the native JavaScript RegExp engine, meaning what you test here is exactly how it will perform in your Node.js or browser-based applications. We support all modern flags including dotAll (s) and unicode (u).

Common Questions

No. All processing happens locally in your browser using standard JavaScript APIs. We don't log your patterns or your test strings.

g (global) finds all matches rather than stopping at the first. i (ignoreCase) makes the pattern case-insensitive. m (multiline) changes how ^ and $ behave with line breaks.

Absolutely. You can paste thousands of lines of text to test how your pattern handles edge cases at scale.

From the Builder

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