Free Regular Expression Tester
Test regular expressions online against sample text and inspect the matches instantly. Useful for validating search patterns, debugging replacements, and building reliable input validation rules.
How to Use the RegEx Tester
Enter a regular expression pattern in the first field and the test text in the second field, then click Test RegEx. The tool runs the expression against your sample text and lists each match in the output area. Use Clear to reset all fields.
Key Features
- Tests regular expressions directly in the browser
- Lists all matches found in the sample input
- Helpful for validation patterns, parsers, and text extraction
- Shows regex syntax errors for quick debugging
- Simple interface for iterative pattern testing
Why Use a Regex Tester?
Regular expressions are powerful but easy to get wrong. A tester helps you confirm whether a pattern matches the right content before you use it in form validation, search tools, automation scripts, or parsing logic.