iOS提取字符串

+ (BOOL)IsChinese:(NSString *)str {
    for(int i=0; i< [str length];i++){
        int a = [str characterAtIndex:i];
        if(a > 0x4e00 && a < 0x9fff)
        {
            return YES;
        }
    }
    return NO;
}

+ (NSString *)isSpecialCharacter:(NSString *)str{
    NSCharacterSet *doNotWant = [NSCharacterSet characterSetWithCharactersInString:@"@／：；（）¥「」＂、[]{}%-+=_\\|~＜＞$€^•'@$%^&()_+'\""];
    str = [[str componentsSeparatedByCharactersInSet:doNotWant] componentsJoinedByString:@""];

    return str;
}

-(NSString *)filterCharacterFromOriginStr:(NSString *)originalString
{
    NSMutableString *numberString = [[NSMutableString alloc] init];
    NSString *tempStr = [[NSString alloc] init];
    NSScanner *scanner = [NSScanner scannerWithString:originalString];
    // 提取包含0-9和*#的字符串
    NSCharacterSet *numbers = [NSCharacterSet characterSetWithCharactersInString:@"0123456789*#"];

    while (![scanner isAtEnd]) {
        // Throw away characters before the first number.
        [scanner scanUpToCharactersFromSet:numbers intoString:NULL];

        // Collect numbers.
        [scanner scanCharactersFromSet:numbers intoString:&tempStr];
        [numberString appendString:tempStr];
        tempStr = @"";
    }
    // Result.

    return numberString;
}