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Using \SplitArgument with r() arguments in xparse

I have been experimenting with using the xparse package for custom document macros with a Markdown-like syntax. For example, I used to write \cut{x}{P}{Q} to produce . With the help of xparse, I ...
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Stringified commands to macros sequence [closed]

First, what is the proper terminology for a "string" in TeX/LaTeX that is an argument for a macro? e.g., \macro{somestring} Obviously somestring is a token, set of tokens, string, argument, etc. I ...