NSCharacterSet详解

 1 controlCharacterSet//控制符 2 whitespaceCharacterSet 3 whitespaceAndNewlineCharacterSet//空格换行 4 decimalDigitCharacterSet//小数 5 letterCharacterSet//文字 6 lowercaseLetterCharacterSet//小写字母 7 uppercaseLetterCharacterSet//大写字母 8 nonBaseCharacterSet//非基础 9 alphanumericCharacterSet//字母数字10 decomposableCharacterSet//可分解11 illegalCharacterSet//非法12 punctuationCharacterSet//标点13 capitalizedLetterCharacterSet//大写14 symbolCharacterSet//符号15 newlineCharacterSet//换行符