Update NAME_REGEX as per bug #1916325 #1
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The NAME_REGEX currently used is "[a-z_][a-z0-9_-]*" which does correctly prevent hostnames starting with a hyphen.. but also prevents otherwise perfectly valid hostnames that start with a number. (Interestingly, an underscore is not defined as a valid hostname character, but is included as valid in the regex, I'm not sure why this is included but am leaving it in for backwards compatibility) This patch adds 0-9 as valid characters at the start of a hostname, as per https://man7.org/linux/man-pages/man7/hostname.7.html#:~:text=Valid%20characters%20for%20hostnames%20are,to%20an%20address%20for%20use. Each element of the hostname must be from 1 to 63 characters long and the entire hostname, including the dots, can be at most 253 characters long. Valid characters for hostnames are ASCII(7) letters from a to z, the digits from 0 to 9, and the hyphen (-). A hostname may not start with a hyphen.
Also adjust displayed message to match. Tested locally using 'make dryrun'
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The NAME_REGEX currently used is "[a-z_][a-z0-9_-]*" which does correctly prevent hostnames starting with a hyphen.. but also prevents otherwise perfectly valid hostnames that start with a number. (Interestingly, an underscore is not defined as a valid hostname character, but is included as valid in the regex, I'm not sure why this is included but am leaving it in for backwards compatibility)
This patch adds 0-9 as valid characters at the start of a hostname, as per https://man7.org/linux/man-pages/man7/hostname.7.html#:~:text=Valid%20characters%20for%20hostnames%20are,to%20an%20address%20for%20use.
Each element of the hostname must be from 1 to 63 characters long
and the entire hostname, including the dots, can be at most 253
characters long. Valid characters for hostnames are ASCII(7)
letters from a to z, the digits from 0 to 9, and the hyphen (-).
A hostname may not start with a hyphen.