* doc/emacs/search.texi (Lax Search): Don't use ".." inside @samp,
it looks confusing, especially in print. (Bug#51020)
precisely, Emacs matches each sequence of space characters in the
search string to a regular expression specified by the variable
@code{search-whitespace-regexp}. For example, to make spaces match
-sequences of newlines as well as spaces, set it to
-@samp{"[[:space:]\n]+"}. The default value of this variable considers
+sequences of newlines as well as spaces, set it to the regular expression
+@samp{[[:space:]\n]+}. The default value of this variable considers
any sequence of spaces and tab characters as whitespace.
If you want whitespace characters to match exactly, you can turn lax
still applies for shorter search strings, which avoids flicker in the
search buffer due to too many matches being highlighted.
----
++++
*** The default 'search-whitespace-regexp' value has changed.
This used to be "\\s-+", which meant that it was mode-dependent whether
newlines were included in the whitespace set. This has now been