The tool creates a JavaScript `RegExp` object from your pattern and flags, then uses it to find all matches in your test string. The results are highlighted instantly, giving you immediate feedback as you type.

1. Enter your regex pattern in the 'Regular Expression' field.
2. Add any flags you need (like `g` for global or `i` for case-insensitive).
3. Type or paste the text you want to test in the 'Test String' area.
4. See your matches highlighted instantly in the results panel.

• Validating an email address or phone number format.
• Extracting all the links from a block of HTML.
• Building a search-and-replace pattern for your code editor.

• Real-Time Highlighting: Matches and capture groups are highlighted as you type.
• Flag Support: Supports all standard JavaScript regex flags (g, i, m, s, etc.).
• Detailed Match List: See a clear list of all matches found.
• Error Detection: Instantly flags invalid regex patterns.

Regular expressions (regex) are powerful patterns used to match and manipulate text. They are a fundamental tool in programming for tasks like input validation, data scraping, and text processing. This tool provides a safe and easy way to experiment with them.

All calculations and data processing for this tool are performed locally in your browser. UtilToolkits does not send any of your data to an external server, ensuring your information remains private and secure.