去除字符串中的特殊字符

http://www.jianshu.com/p/cc4064091925
http://www.cocoachina.com/ios/20160111/14926.html

- (NSString *)getChineseStringWithString:(NSString *)string
{
    //(unicode中文编码范围是0x4e00~0x9fa5)
    for (int i = 0; i < string.length; i++) {
        int utfCode = 0;
        void *buffer = &utfCode;
        NSRange range = NSMakeRange(i, 1);
        
        BOOL b = [string getBytes:buffer maxLength:2 usedLength:NULL encoding:NSUTF16LittleEndianStringEncoding options:NSStringEncodingConversionExternalRepresentation range:range remainingRange:NULL];
        
        if (b && (utfCode >= 0x4e00 && utfCode <= 0x9fa5)) {
            return [string substringToIndex:i - 1];
        }
    }
    return nil;
}

NSString *string = @"你bushi1222真正90-快乐";
NSRegularExpression *regular = [NSRegularExpression regularExpressionWithPattern:@"[a-zA-Z\u4e00-\u9fa5]+" options:0 error:NULL];
result = [regular stringByReplacingMatchesInString:string options:0 range:NSMakeRange(0, [string length]) withTemplate:@""];
result 即为截取后的结果。

#pragma mark -获取一段字符串中的中文字
+ (NSArray *)getAStringOfChineseWord:(NSString *)string
{
    if (string == nil || [string isEqual:@""])
    {
        return nil;
    }
    NSMutableArray *arr = [[NSMutableArray alloc]init];
    for (int i=0; i<[string length]; i++)
    {
        int a = [string characterAtIndex:i];
        if (a < 0x9fff && a > 0x4e00)
        {
            [arr addObject:[string substringWithRange:NSMakeRange(i, 1)]];
        }
    }
    return arr;
}

 #pragma mark -获取一段字符串中的中文字和中文字符
+ (NSArray *)getAStringOfChineseCharacters:(NSString *)string
{
    if (string == nil || [string isEqual:@""])
    {
        return nil;
    }
    NSMutableArray *arr = [[NSMutableArray alloc]init];
    
    for (int i=0; i<string.length; i++)
    {
        NSRange range = NSMakeRange(i, 1);
        NSString *subStr = [string substringWithRange:range];
        const char *c = [subStr UTF8String];
        if (strlen(c)==3)
        {
            [arr addObject:subStr];
        }
    }
    return arr;
}

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"你的正则表达式" options:0 error:nil];
    NSArray *matches = [regex matchesInString:parsedOutput.string options:0 range:NSMakeRange(0, parsedOutput.string.length)];
    for(NSTextCheckingResult *result in [matches objectEnumerator]){
       NSRange matchRange = [result range];
}

http://www.cocoachina.com/bbs/read.php?tid-262299.html