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Oh wow, that's super impressive. Is there anything that comes to close this functionality today, outside of SNOBOL?

There were, and I kid you not, two simular languages; "SLUSHBOL" and "SPITBOL". But they are lost for the ages. Edit: I see that SPITBOL has been observed. No word on SLUSHBOL.

https://en.wikipedia.org/wiki/Parsing_expression_grammar

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