(IOS)判断密码格式

+(BOOL)validateWithPassword:(NSString *)password

{

    //密码只包含字母，数字，字符中至少两种

    NSString * regex =@"^(?![0-9]+$)(?![a-zA-Z]+$)[a-zA-Z0-9]{6,18}$";

    NSPredicate * pas= [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];

    return[pas evaluateWithObject:password];

}