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

From: Kevin Rodgers
Subject: Re: strange behaviour of `isearch-forward-regexp'
Date: Mon, 30 Jun 2003 09:46:30 -0600
User-agent: Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv: Gecko/20020406 Netscape6/6.2.2

Paul Pogonyshev wrote:

GNU Emacs (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>

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