JavaScript Regular Expression Parser & Visualizer

Regulex is a javascript regular expression parser and visualizer.

  • Written in pure JavaScript. No backend needed.
  • You can embed the graph in you own site through html iframe element.
  • Detailed error message. In most cases it can point out the precise syntax error position.
  • No support for octal escape. Yes it is a feature. ECMAScript strict mode doesn’t support octal escape in string,but many browsers still support octal escape in regex. I make things easier. In regulex, DecimalEscape will always be treated as back reference. If the back reference is invalid, e.g. /\1//(\1)//(a)\2/,or DecimalEscape appears in charset(because in this case it can’t be explained as back reference, e.g. /(ab)[\1]/), Regulex will always throw an error.

Website Demo

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