Regex Tester & Explainer
Test and validate regex expressions online with real-time match highlighting and syntax explanation.
What is Regular Expression?
A Regular Expression (Regex) is a pattern used to match combinations of characters in text. It’s widely used in text processing, data validation, search and replace operations.
How to Use This Tool?
- Select Preset: Click preset buttons (like “Email”, “Phone”) to quickly load common patterns.
- Enter Pattern: Type or modify your regex pattern in the input field.
- Enter Test Text: Input the text you want to test in the text area below.
- View Results: See real-time match highlighting and group details.
Common Regex Patterns
| Scenario | Pattern | Description |
|---|---|---|
[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,} |
Match email addresses | |
| Phone | \d{3,4}-?\d{7,8} |
Match domestic phone numbers |
| URL | https?://[^\s]+ |
Match web links |
| Date | \d{4}-\d{2}-\d{2} |
Match YYYY-MM-DD format |
| Color | #[0-9A-Fa-f]{6} |
Match hex color codes |
| IP Address | \b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b |
Match IPv4 addresses |
FAQ
Is this tool secure?
Absolutely secure. This tool runs entirely in your browser; no data is uploaded to any server.
What regex syntax is supported?
This tool supports JavaScript regex syntax, including:
- Character classes:
[abc],[^abc],\d,\w,\s - Quantifiers:
*,+,?,{n},{n,},{n,m} - Anchors:
^,$,\b - Groups:
(...),(?:...),(...)
How to ignore case?
Check the “Ignore Case” option to make pattern matching case-insensitive.