Regex Playground
Test regex patterns with live highlighting
Regular Expression
//g
Flags:
Test String
Matches Highlighted1 match found
The quick brown fox jumps over the lazy dog. Email: test@example.com, Phone: 123-456-7890
All Matches
test@example.com
About Regex Tester & Playground
1What is it?
Test your Regular Expressions (Regex) in real-time. This interactive playground highlights matches as you type, helping you debut and refine complex patterns. Supports standard JavaScript Regex features including flags, capture groups, and lookaheads.
2Use Cases
- Validate email or phone number patterns
- Debug why a specific regex isn't matching
- Extract data using capture groups
- Learn regex syntax by experimenting
- Verify password strength rules
3Examples
Email Validation
Input
user@example.com
Output
Matches: matches email pattern
Date Extraction
Input
2024-01-01
Output
Capture Groups: Year, Month, Day
?Frequently Asked Questions
Which Regex flavor is supported?
We use the JavaScript RegExp engine, which is standard for web development and supports most common regex features like greedy/lazy quantifiers and positive/negative lookaheads.
How do I match newlines?
Use the 'Global' (g) and 'Multiline' (m) flags. The dot (.) typically doesn't match newlines, so use [\s\S] to match absolutely any character including line breaks.