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About Regex Capture Group Visualizer
The Regular Expression Capture Group Visualizer renders visual, color-coded railroad diagrams and hierarchical bracket trees for nested capture groups, lookarounds, and quantified alternatives.
How to Use Regex Capture Group Visualizer
Step 1
Enter any regular expression into the editor.
Step 2
Inspect the color-coded visual hierarchy and railroad diagram.
Step 3
Hover over group boxes to highlight corresponding syntax components.
Step 4
Click "Export SVG Diagram" or copy structure data.
Practical Use Cases for Regex Capture Group Visualizer
Visualizing Deeply Nested Regex Capture Groups
Understand group indexing in complex regular expressions with nested parentheses (e.g. `((A)(B(C)))`) through distinct color-coded bracket boundaries.
Teaching and Debugging Regular Expressions
Visually explain regex logic to team members and students with interactive visual flow charts and syntax trees.
Input & Output Examples
Visualizing Nested Groups
`(?<date>(?<year>\d{4})-(?<month>\d{2}))`Group 1 (`$<date>`): `(\d{4})-(\d{2})` [Color: Blue] | Group 2 (`$<year>`): `\d{4}` [Color: Green] | Group 3 (`$<month>`): `\d{2}` [Color: Orange]Key Features & Performance
- ✓Color-coded nested bracket pairs with group index badges.
- ✓Interactive railroad / state machine flow chart diagram.
- ✓Maps matched text spans directly to corresponding visual group tokens.
- ✓100% Client-Side SVG & Canvas rendering.
- ✓1-Click Export SVG diagram or copy breakdown table.
Key Terminology & Definitions
Railroad Diagram (Syntax Diagram)
A graphical way to represent formal grammar and regular expressions showing all valid pathways through a pattern.
Capture Group Indexing Order
Numbered capture groups are indexed from left to right according to the position of their opening parenthesis `(`.