Test Text with RegExp
Validate if your text matches a Regular Expression pattern. True or False testing.
Validation Pattern
Validation Tips
^ at start and $ at end for strict full-string matching() to extract parts of the matchQuick Patterns
^[\w.-]+@[\w.-]+\.\w+$^(?=.*[A-Z])(?=.*\d){8,}$Validate with Regex
The Test Text with RegExp tool allows you to perform a quick "True" or "False" check against a pattern. It's useful for building validation logic, like checking if a user input matches an expected format (email, phone, zip code) before implementing it in your code.
How to Use
- Select a validation preset or enter your custom pattern
- Enter test string or upload a file
- See result - Green checkmark (MATCH) or red X (NO MATCH)
- Review capture groups if pattern includes () parentheses
- Download JSON report for documentation
Common Use Cases
Input Validation
Test if user inputs meet strict criteria before implementing validation in production code.
Pattern Development
Build and test complex validation patterns with edge cases before deploying.
Quick Checks
Instantly verify if a specific string matches your validation requirements.
Common Uses
Input Validation
Verify if strings meet strict criteria (e.g., at least one number and one uppercase letter).
Security Checks
Ensure inputs don't contain forbidden characters or patterns.
How it works
- Compile: We create a regex object.
- Test: We run
regex.test(text). - Report: We display a big green "Match Found" or red "No Match".
Example
Frequently Asked Questions
What regex engine is used?
We use JavaScript's native RegExp engine, which is compliant with ECMAScript standards. All ES6+ regex features including lookaheads, lookbehinds, and Unicode flags are supported.
Is my data safe?
Yes, all validation happens locally in your browser. No regular expressions or text data are sent to our servers. Your patterns and test strings remain completely private.
How do I enforce strict full-string matching?
Add ^ at the beginning and $ at the end of your pattern. For example, ^[a-z]+$ ensures the ENTIRE string contains only lowercase letters, not just a portion of it.
Can I upload files to test?
Yes! Click the Upload button in the Test String header to load .txt files. Perfect for testing validation patterns against sample data or edge cases stored in files.
What are capture groups?
Capture groups are parts of your regex enclosed in parentheses (). If the pattern matches, we extract and display these groups separately. For example, in pattern (\d+)-(\w+), you'd see two groups: the number and the word.
Can I download the validation result?
Yes! Click the JSON button to download a complete test report including the input text, pattern, flags, result (MATCH/NO MATCH), capture groups, and timestamp. Great for documentation.
What validation presets are available?
We provide 6 common validation presets: Email Validation, URL Validation, Phone (US), Strong Password, Username, and Hex Color. Each preset includes the correct pattern and flags for strict validation.
How do I test password strength requirements?
Use the 'Password Strong' preset which requires: minimum 8 characters, at least one uppercase letter, one lowercase letter, one digit, and one special character (@$!%*?&). Perfect for implementing secure password validation.
Why use this instead of implementing regex directly in code?
Test your validation patterns with edge cases BEFORE implementing them in production code. Catch issues early, see capture group extraction, and download test reports for documentation. Saves debugging time later.
Can I test multiline text?
Yes! Toggle the 'm' (multiline) flag to make ^ and $ match line breaks within your text, not just the start/end of the entire string. Essential for validating multi-line inputs like addresses or logs.