Regex Tester
Test and debug regular expressions with real-time matching, explanations, and common pattern examples. Perfect for developers and data processors.
Regular Expression
Enter your regular expression pattern
Test String
Enter text to test your regex against
Matches0 found
No matches found
Highlighted Text
Your test string with matches highlighted
Common Patterns
Click to load commonly used regex patterns
Quick Reference
Common regex syntax and patterns
Character Classes
. - Any character\d - Digit (0-9)\w - Word character\s - Whitespace[abc] - Character set[^abc] - Negated setQuantifiers
* - 0 or more+ - 1 or more? - 0 or 1{n} - Exactly n{n,m} - Between n and m{n,} - n or moreAnchors
^ - Start of string$ - End of string\b - Word boundary\B - Non-word boundary| - Alternation (OR)() - Capturing groupRelated Tools
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Frequently Asked Questions
- What regex flavors are supported?
- Our regex tester uses JavaScript regex flavor by default. It supports most common regex features including character classes, quantifiers, anchors, groups, and lookarounds.
- Can I test regex flags like global and case-insensitive?
- Yes! You can test different flags including global (g), case-insensitive (i), multiline (m), and others. Toggle these flags to see how they affect your pattern matching.
- How do I test regex for different programming languages?
- While we use JavaScript regex engine, most basic patterns work across languages. For language-specific features, test the final pattern in your target programming environment.
- Does the tool explain what my regex pattern does?
- The tool highlights matches and shows results in real-time. For detailed pattern explanations, you can use regex documentation or break down complex patterns into simpler parts.
How to use Regex Tester
Follow these simple steps to get started with the Regex Tester tool
- 1
Enter your regular expression pattern in the regex input field
- 2
Add your test text in the text area below
- 3
Select appropriate flags (global, case-insensitive, etc.) if needed
- 4
View real-time highlighting of matches in your test text
- 5
Refine your pattern based on the match results and test with different inputs