Use regex to check that the port is a series of digits 0-9. #32
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Fixes #31
From the URL spec at https://url.spec.whatwg.org/#url-port-string
A URL-port string must be one of the following:
This example from Microsoft uses the
\d+
regex, so that seems like a fine way to match port numbers:https://docs.microsoft.com/en-us/dotnet/standard/base-types/how-to-extract-a-protocol-and-port-number-from-a-url