Update isExternal regex to comply with rfc3986

[go2sh]

Updates the regex to use the scheme specification from rfc3986.
This allows the user to use urls like spotify: or vscode: for special application usage.

Summary

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

[flozero]

hello @go2sh ! Thank's for your time and effort. Can you give us some example usage of that please ? Even if it look great we need maybe to update some part of the docs with that

[go2sh]

I use this in the index.md file:

actionText: Install Extension
actionLink: "vscode:extension/go2sh.cmake-integration"

I use vuepress as documentation generator for my visual studio code extension and I want to provide a link to directly install it in vscode. VSCode can register the schema "vscode" inside the browser and if so, vscode opens the referenced page.

[flozero]

Ok can you resolve the conflict and give me the link of your github project i will have a look at it.

Thank's for your time !

[ulivz]

Maybe this issue had been addressed at #1731