What meanings do we want to convey? Regexp are now more like functions, their field of use has enlarged to the parsing of whole language defined by grammars. And parsing grammar is the selling point. What can do more can certainly do less. I would call them grammexen to get the point thru: "you can parse using grammexen, you can't using plain old regexen". It makes clear that perl6 is not only for assembling or lexing strings but that it can handle complex languages. grammex ends like regex, so it is a reminder that it is a related concept.

I want to spell it loud and clear. I don't want to hide the clue about grammar in an acronym because most acronyms are anacronyms.

-- stefp -- check out TeXmacs wiki