docs: private boolean isSpecial(final char chr) {
  		return ((chr == '.') || (chr == '?') || (chr == '*') || (chr == '^') || (chr == '$') || (chr == '+')
  				|| (chr == '[') || (chr == ']') || (chr == '(') || (chr == ')') || (chr == '|') || (chr == '\\')
  				|| (chr == '&'));
  	}