Autolinking doesn't work for TLDs longer than 4 characters

[Gittenburg]

Summary

The Markdown autolinking only works for TLDs up to 4 characters.
Even though there are many new TLDs with more than 4 characters, e.g. .africa, .computer, etc.
In fact TLDs can be as long as 63 characters.

Steps to reproduce

With Mattermost v5.32.1, send a message with:

* example.com/page
* example.computer/page

Expected behavior

Both links are autolinked.

Observed behavior (that appears unintentional)

Only the first link is autolinked since the TLD of the second link has more than 4 characters.

Possible fixes

Increase the autolink TLD limit to 63 characters or alternatively check the TLD against a list of all TLDs.

[amyblais]

Thanks, opened a ticket: https://mattermost.atlassian.net/browse/MM-33321

[amyblais]

We are closing some older tickets that have been inactive for a while. If the issue persists on the latest server version, feel free to re-open this issue.