正则表达式

^[\u4E00-\u9FA5A-Za-z0-9]+$

除去特殊符号 只允许中文、英文字母、数字

//验证是否包含特殊字符
+(BOOL) SpecialCharactersValidateUserName:(NSString *)name

{
    NSLog(@"name %@", name);
//    "[^a-zA-Z0-9\u4E00-\u9FA5]"
    NSString *userNameRegex = @"^[\u4E00-\u9FA5A-Za-z0-9]+$";
    
    NSPredicate *userNamePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",userNameRegex];
    
    BOOL B = [userNamePredicate evaluateWithObject:name];
    
    return B;
    
}