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Consider a regex for testing port numbers.
(6553[0-5]|655[0-2]\d|65[0-4]\d{2}|6[0-4]\d{3}|[1-5]\d{4}|[1-9]\d{0,3})
This is not valid in Android.
Any idea what a port number regex should look like in Android?
Generally, regex isn’t that great for numerical validation. I’d recommend using
Integer.parseInton a matched group and then check that to see if it’s less than 65536.