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Characters to avoid in URL

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*7e4c0b    (2009-05-07)
Characters to avoid in URL


I'd like to know what characters to avoid in url and why ?

I've read that ?,@,#,&,$ may not be recognized by search engines like Google, but some sites use it with success.

Is there a definitive list of characters that search engines do not accept ?

Thank you very much.

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