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Regex Railroad Diagram

Paste a regex and preview a readable railroad-style breakdown of tokens, groups, and quantifiers.

Examples
Railroad diagramReady
Paste a regex and preview a readable railroad-style breakdown of tokens, groups, and quantifiers.

How to use

  1. 1Paste source text into the editor.
  2. 2Load a sample when you need a starting point.
  3. 3Review the generated visualization and export when useful.

Common use cases

Developer documentationCode reviewAI-generated output validation

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FAQ

Does this tool use AI?

No. It parses and visualizes the source locally in the browser.

Turn regular expressions into simple railroad-style diagrams for documentation and code review.

Paste a regex and preview a readable railroad-style breakdown of tokens, groups, and quantifiers.

This fits DiagramPreview workflows where developers paste generated or hand-written text and need a fast visual check before publishing documentation.