bug#58992: 28.2; "lax space matching" no longer works

[Eli Zaretskii]

> Date: Fri, 4 Nov 2022 04:30:38 +0100
> From: Vincent Lefevre <vincent@vinc17.net>
> Cc: 58992@debbugs.gnu.org
> 
> The [[:space:]\n]+ in the doc is misleading. Since a newline character
> is a whitespace, [[:space:]]+ is sufficient.

That is only true in major modes where the newline has the
"whitespace" syntax, see the description of [:space:] in the ELisp
manual.  I guess you tried this in Fundamental mode or somesuch?