Re: isearch-forward and isearch-forward-regexp documentation

[Richard M. Stallman]

    - When I wanted to find out why isearch-forward-regexp
      was matching multiple spaces when I had typed only
      one space, the first place I looked was the Emacs
      info node for regular expresion syntax, "19.5 Syntax
      of Regular Expressions", but that node says nothing
      about it.  It took me a while to think to look in
      the previous info node, "19.4 Regular Expression
      Search".

      The feature should also be mentioned in info node
      19.5.

This is not part of regular expression syntax, it is a special
feature of regular expression searching in Emacs buffers.

I will try to clarify some of these points, but I don't think the doc
string has to mention every detail of the commands' features.