Operators comprised more than one symbols

[nsgnkhibdk2cls0f]

On lexer file, operators is defined as a string without any delimiter between the symbols like this:

    { pattern = "[%+%-=/%*%^%%<>!~|&]",     type = "operator" },

Then how could we handle operators comprised more than one symbols like >>, <<, >>>, <<<, ->, <>, :=,...?

[Guldoman]

You can add other patterns that have type operator.

That pattern will still apply to >>, <<, >>>, <<<, -> and <>, as the tokenizer will apply the operator token type to each character.
:= might instead result in : matching with some other rule and = matching as operator.
So to make it match the entire := you can add a rule like:

{ pattern = ":=",     type = "operator" },