bug#42045: 27.0.91; display-format-alist for X11 does not recognize DISPLAY with IPv6 literal

[Lars Ingebrigtsen]

Robert Pluim <rpluim@gmail.com> writes:

> That regexp won't work, since now youʼre requiring the '[' and ']' to
> be present.
>
> "\\`\\[?[^]]*\\]?:[0-9]+\\(\\.[0-9]+\\)?\\'" would fix that, but since
> we donʼt really care what comes before the ':', so would
>
> "\\`.*:[0-9]+\\(\\.[0-9]+\\)?\\'"

I think that makes sense?  So I've pushed Robert's regexp to Emacs 28.

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