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Description
The "best" way to replicate generating examples for absent operator groups is with a negative lookbehind, e.g:
(?~abc) --> (?:.(?<!abc))*
But since look-behinds are irregular, this library cannot support that! A possible workaround would be to replace the group with a repetition of the first letter negated, e.g:
(?~abc) --> (?:[^a]*)
However (!!) this generalisation is not always possible:
(?~\wa|\Wb) --> ???
Therefore, the only 100% reliable option - which is what this gem currently does - is just to match "nothing"!
/(?~abc)/.examples #=> [""]
However, as shown above, this library could, at least, be enhanced to deal with specific scenarios in better ways. But such a strategy needs to be optimised for generalisation and reliability.