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Regex Tester

Test regular expressions with live matching and group capture.

Features

  • Live regex matching with real-time results as you type.
  • Visual highlighting of matches and captured groups in your text.
  • Support for multiple regex flavors including JavaScript, PCRE, and Python.
  • Built-in regex cheat sheet with common patterns and examples.
  • Save and load your regular expressions for future testing.

How to Use

  1. Enter your regular expression in the pattern input field.
  2. Type or paste your test text in the sample text area.
  3. View highlighted matches and captured groups instantly.
  4. Adjust flags and syntax options to match your specific regex flavor.
  5. Copy your tested regex or download it for later use.

Frequently Asked Questions

What is a regular expression?

A regular expression is a sequence of characters that specifies a search pattern. It's used for pattern matching with strings, particularly in text processing and validation.

How do I use the regex tester?

Simply enter your regex pattern in the top input field, then type or paste your test text below. The tool will highlight matches and captured groups in real-time.

What regex flavors are supported?

Our regex tester supports JavaScript, PCRE, Python, and several other popular regex flavors. You can select your preferred syntax from the dropdown menu.

How do I capture groups in regex?

Use parentheses () in your pattern to create capturing groups. Our tool will highlight each group separately in your test text and display the captured values.

Can I save my regex patterns?

Yes, you can save your tested regex patterns to your browser's local storage. Just click the save button and give your pattern a name for easy access later.