检查NSString是否包含特殊字符和数字

Question

我需要检查一个字符串是否包含一个大写字母,一个小写字母,一个整数和一个特殊字符.我该如何检查？

Answer 1

没有任何额外的框架:

NSCharacterSet * set = [[NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"] invertedSet];

if ([aString rangeOfCharacterFromSet:set].location != NSNotFound) {
    NSLog(@"This string contains illegal characters.");
}

您也可以使用正则表达式(此语法来自RegexKitLite:http://regexkit.sourceforge.net ):

if ([aString isMatchedByRegex:@"[^a-zA-Z0-9]"]) {
    NSLog(@"This string contains illegal characters.");
}

Answer 2

发现稍微好一点的实现.对Ameesh答案的改进

- (BOOL)isValidString:(NSString *)string
{
    return [string rangeOfCharacterFromSet:[NSCharacterSet uppercaseLetterCharacterSet]].location != NSNotFound &&
    [string rangeOfCharacterFromSet:[NSCharacterSet lowercaseLetterCharacterSet]].location != NSNotFound &&
    [string rangeOfCharacterFromSet:[NSCharacterSet decimalDigitCharacterSet]].location != NSNotFound;
}