code: public static boolean isUnaryExpression(String expression) {
  		int first = expression.indexOf("(");
  		int last = expression.lastIndexOf("(");
  		if (first < 0 || last < 0) {
  			return true;
  		}
  		return ! (first == 0 && last > first);
  	}
docs: Checks if the passed in expression is a unary operator expression
  Example: (1,2,3) or (1-60) are unary operator expressions
  (1-60)(61-88) is a binary operator expression, representing
  a cartesian product of the two parenthesised lists
  
  @param expression
  @return true if expression is a unary operator expression