Re: strange behaviour of `isearch-forward-regexp'

[Kevin Rodgers]

Paul Pogonyshev wrote:

> GNU Emacs 21.3.50.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars) of 
> 2003-06-24 on localhost.localdomain
>
> While searching for " ?t" regular expression, letter 't' in word
> "reset" doesn't match.  This is very strange since searching for
> "t?t" and even "^I?t" does match the letter.  Is it "a feature"
> or a bug somewhere in Emacs?


It's a feature, though it doesn't appear to be documented in the Emacs manual:

| search-whitespace-regexp's value is "\\s-+"
|
| Documentation:
| *If non-nil, regular expression to match a sequence of whitespace chars.
| This applies to regular expression incremental search.
| You might want to use something like "[ \t\r\n]+" instead.
| In the Customization buffer, that is `[' followed by a space,
| a tab, a carriage return (control-M), a newline, and `]+'.

You need to type `C-s C-q SPC ? t', or set search-whitespace-regexp to nil.

--
<a href="mailto:&lt;kevin.rodgers&#64;ihs.com&gt;";>Kevin Rodgers</a>