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From: pjb@informatimago.com (Pascal J. Bourguignon)
Newsgroups: gmane.emacs.help
Subject: Re: Help with regexp
Date: Tue, 01 Dec 2009 22:07:46 +0100
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Xavier Maillard <xma@gnu.org> writes:

> Hi,
>
> I am trying to find the regexp that could match on these:
>
> "=>foo"
> "=>foo:bar"
> "=>foo:bar:baz"
>
> The regexp must match on all of these strings. The string can't
> be deeper than 3 levels (like latest example) and each component
> may have spaces.
>
> How can I match this ?

"=>\\([^:]*\\(\\|:[^:]*\\(\\|:[^:]*\\)\\)\\)"

Accepts also "=>::".  Replace the stars with \\+ if you want to have
at least one character between the colons.

(mapcar (lambda (s)
         (string-match "^=>\\([^:]*\\(\\|:[^:]*\\(\\|:[^:]*\\)\\)\\)$" s))
        '("=>foo"
          "=>foo:bar"
          "=>foo:bar:baz"
          "=>" "=>:" "=>::" 
          "=>This is : also a good : example"
          "=>And this one !@#$^^& also"
          ;; no match:
          "=>:::" "=>a:b:c:d"))
--> (0 0 0 0 0 0 0 0 nil nil)


-- 
__Pascal Bourguignon__