RegistryUtils

internal function isSubdomainValid

Validates that a subdomain name is composed only from characters in the allowed character set:

• the lowercase letters a-z
• the digits 0-9
• the hyphen -

function isSubdomainValid(string subDomain) internal pure returns (bool)

Input	Type	Description
subDomain	string	The name of the DAO.
Output
0	bool	true if the name is valid or false if at least one char is invalid.

This function allows empty (zero-length) subdomains. If this should not be allowed, make sure to add a respective check when using this function in your code. Aborts on the first invalid char found.