[Waterluvian]

A lot of regex testers do this and I can't imagine writing a regex or a parser without.

[anon_tor_12345]

>a parser without

can you show me a parser generator that produces this kind of visualization?

[BeKindAndLearn]

Not a syntactic parser generator, but [chevrotain](https://chevrotain.io/playground/) can generate flow diagrams for your ruleset. IIRC not just in the playground, but in general.

[4silvertooth]

antlr has many that produces such visualization, vscode has some great plugins for it.

[anon_tor_12345]

great thanks!