Regex Visualizer
Don't just read regex, see it. Our visualizer breaks down complex patterns into understandable building blocks to help you debug and learn.
👁️ Visual Breakdown
See the hierarchy of your regex. Understand how groups, quantifiers, and character classes relate to each other.
🐞 Debugging Aid
Spot nesting errors and logic flaws quickly by looking at the structure instead of a flat string.
🎓 Learning Tool
Perfect for beginners to understand how regex engines parse and interpret patterns.
How to Read Regex Visualizations
Structure & Hierarchy
- •Railroad Diagrams: Read from left to right. Lines that split indicate alternatives (OR logic), and loops indicate repetition.
- •Nesting: Boxes inside other boxes represent captured groups or nested structures.
Common Symbols
- •Quantifiers: Notated as loops or labels (e.g., "0-1 times", "1+ times") showing how many times an element can repeat.
- •Character Classes: Represented as blocks containing the allowed characters (e.g., [a-z], \d).
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Popular Patterns
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Email Address
Validate standard email formats. Includes support for common domains and subdomains.
Try Email Regex →📅
Dates (YYYY-MM-DD)
Match dates in ISO 8601 format. Validates year, month, and day structure.
Try Date Regex →📱
US Phone Number
Match various US phone formats including dashes, dots, and parentheses.
Try Phone Regex →