Regex Tester

Building a regular expression by trial and error in your codebase is slow. This tool lets you test a pattern against sample text live, using standard JavaScript regex syntax and flags.

Enter a pattern and test string above.

How to Use This Tool

  1. Type your regular expression pattern (without the surrounding slashes).
  2. Set any flags you need, such as g for global or i for case-insensitive.
  3. Paste your test string — matches are found and listed automatically.

Why Use ToolVigo's Regex Tester

  • Live matching as you type, using the browser's native JavaScript regex engine.
  • Supports all standard flags (g, i, m, s, u, y).
  • Clear error messages for invalid patterns.

Supported Formats

Standard JavaScript (ECMAScript) regular expression syntax and flags.

Privacy & Security

This tool runs entirely in your browser. Your input is never uploaded to ToolVigo's servers, and nothing is stored once you leave the page.

Frequently Asked Questions

Does this use the same regex engine as my code?

Yes, if your project uses JavaScript. Other languages (like PHP's PCRE or Python's re module) have slightly different regex syntax, so results may not always match exactly.

What does the "g" flag do?

The global flag makes the regex find all matches in the string rather than stopping after the first one.

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