Phabricator url including a port do not work

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Environment

• Python version: 3.10.x
• Phabfive version: latest master version

Steps to Reproduce

When developing code, i stumbled upon this that when i export a development phabricator url including a port number, it fails a validation step that it should not fail on. We assume that in our regex checks that we have specified a valid URL instead of just trying the URL no matter what it is and letting it fail.

export PHAB_URL=http://phabricator.domain.tld:81/api/

Result: PHAB_URL is malformed, example: http://127.0.0.1/api/

Possible solution to this problem is to either remove the regex check, implement port checking in the regex, change from regex validation to be a requests/curl validation instead