Hello,
Welcome to MilesWeb Forum. It's good to know about you.
Registration of domain names with special characters is not possible. The only valid characters that a domain name can have include letters, numbers and a hyphen (-). Any other special characters like the underscore "_" or an exclamation mark "!" are Not permitted. Therefore, you won't be able to register any domain name with special characters.
Contrary to that, you can consider registering a domain name with the appropriate TLD. MilesWeb offers many TLD's like .com, .biz, .info, .net, .org, .co.uk, .in etc. Along with a good domain name, having a suitable TLD is extremely beneficial.
What is the domain name that you would like to register?