Visualize regular expression syntax tracks, loops, capture groups, and test matches in real time.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Type or paste your regex pattern and toggle regex flags (g, i, m, s, u).
Examine the sequential railroad diagram illustrating tokens, loops, character sets, and branches.
Paste test strings to see real-time match highlights or download the SVG diagram.
A railroad diagram is a visual syntax map that illustrates regular expressions as railway tracks, making complex lookaheads, quantifiers, and branching logic instantly readable.
Yes! Click 'Export SVG' to download a clean, scalable vector image of your regex diagram for technical documentation or presentations.
Yes. All regex parsing, AST synthesis, SVG track generation, and match testing execute 100% locally in your browser memory.
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