code: static boolean isAlphanum(int c) {
  		return ( (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || 
  				 (c >= 'A' && c <= 'Z') || c == '_' || c == '$' || c == '\\' || 
  				 c > 126);
  	}
docs: isAlphanum -- return true if the character is a letter, digit,
  underscore, dollar sign, or non-ASCII character.