Regex Tester

Test and debug your Regular Expressions (Regex) instantly with our free online tool. Whether you are validating email formats, scraping data, or configuring server redirects, this tool helps you visualize exactly what your pattern matches in real-time.

What is Regex?

A Regular Expression (Regex) is a sequence of characters that specifies a search pattern. It is used in almost every programming language (JavaScript, Python, PHP) to find, replace, or validate text.

Features

• Real-time Highlighting: Instantly see which parts of your text match your pattern.

• JavaScript Engine: Uses your browser’s native JavaScript regex engine for 100% accurate results.

• Error Detection: Automatically alerts you if your syntax is invalid so you can fix it quickly.

How to Use

1. Enter Pattern: Type your regex in the top box (e.g., [a-z]+ or \d{3}).

2. Add Flags: (Optional) Add flags like g (global), i (insensitive), or m (multiline).

3. Enter Test Text: Paste the text you want to search through.

4. View Results: The tool will highlight every match in the “Result” box below.