iOS 正则 检测是否为手机号

- (BOOL)validateMobile:(NSString *)mobileNum
{
NSString *regex = @"^1[3|5|7|8][0-9]\\d{8}$";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];

if(![pred evaluateWithObject:mobileNum])
{
return NO;
}

else
{
return YES;
}
}