What's the regular expression pattern of Meraki hostname to DNS?

[FredY1]

Example 1:

On Meraki Console:
Host name of Access Point is set to be: Meraki-8-1(Old)
Mac Address: c5:c6:cd:32:23:42

On our DNS manager it shows the machine's DNS is: meraki-8-1-old-c5c6cd322342

Example 2:

On Meraki Console:
Host name is changed to:  --Meraki-8-1
Mac Address: c5:c6:cd:32:23:42

On our DNS manager, machine's DNS now becomes: m-meraki-8-1-e5c6cd322342

Question:

I understand example 1. We change all invalid symbols to hyphen to make it a valid DNS. I do not understand Example 2. Where did the 'm' in the front come from? What's the pattern here?

[alemabrahao]

Is this question more out of curiosity or do you need this information for something specific?

[FredY1]

Need it to develop product. We use Meraki Dashboard API for our product. However Dashboard API does not provide valid DNS or FQDN. Need a way to get DNS.

[PhilipDAth]

This is your own DNS manager you are asking about?  You'll need to take a look at its source code to figure that out.