[feature request] Character separated list

[StarlightIbuki]

Could we have a grammar for that?
Something similar to this:

arguments = { argument * "," }
ipv4 = @{ ASCII_DIGIT{1,3} {3} "." }

(There should be better design but this is just an illustration.)

[huacnlee]

ipv4 = @{ (code ~ "."){3} ~ code }
code = @{ ASCII_DIGIT{1,3} }

If we input: 127.0.0.1 then will get:

- ipv4: "127.0.0.1"