Free Online Regex Tester

/ /
g i m s
Matches: 0
No matches yet. Enter a regex pattern above.

The Best Free Regex Tester Online

Regular Expressions (Regex) are incredibly powerful patterns used by developers to find, validate, and manipulate text. However, writing and debugging them can be notoriously tricky. The GadgetsFocus free online Regex Tester lets you type a pattern and instantly see all matches highlighted in a test string, including captured groups.

How to Use

  1. Enter a Pattern: Type your regular expression into the top input box (between the slashes).
  2. Set Flags: Click the flag buttons to toggle: g (global / find all), i (case insensitive), m (multiline), s (dotAll).
  3. Paste Test String: Enter your test data into the large text area.
  4. View Matches: All matches, their index positions, and any capture groups are displayed in real time below.

Common Use Cases

  • Email Validation: Test patterns like [a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}
  • Phone Numbers: Extract numbers with patterns like \d{3}[-.\s]?\d{3}[-.\s]?\d{4}
  • HTML Tags: Find tags with <(\w+)[^>]*>

Privacy

All regex processing happens locally in your browser via JavaScript’s native RegExp engine. Your code and test data are never transmitted to any server.