search users by their email id on facebook using connect api

I need to search users in facebook by their email id's. I could not find anything relevant to this.

I have seen an application using facebook.users.getByEmail method but I am not able to find more about it.

Please suggest.

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Errata:

> By search I meant i开发者_Go百科f I have a users email id then I need to find uid of that user.

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email property accessed just after you get special permission to retrieve email. so it's impossible. more details here: http://wiki.developers.facebook.com/index.php/Communicating_with_Users_via_Email