Marpa allows you to discard parts of the input stream. And the tokens to be discarded can have various forms. But you may well be better off matching what you can be certain does appear. That means both defining exactly what you want to find and somehow proving that what's in the part you wish to ignore never matches the part to be captured. See also: Marpa's home page <https://savage.net.au/Marpa.html>
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