Here is a solution in Qi+Qi YACC.

(define test-brackets
  X -> (not (= (compile <paren> (COERCE X LIST)) fail!)))

(defcc <paren>
  #\[ <paren> #\] <paren>;
  #\( <paren> #\) <paren>;
  <token> <paren>;
  <e> := [];)

(defcc <token>
  -*- := (if (element? -*- [#\[ #\] #\( #\)]) #\Escape -*-);)

Mark

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