OT: simple regex question

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Hi, how to found into string 2 or more word, only if are all present?

% echo "aa bb cc dd"|egrep -q '(bb|dd)' && echo found

This command show "found" if bb OR dd are in string.
But if I want show "found" only if bb AND dd are present into string.

What egrep (or sed) command I must use?

Many thanks for your reply!

-- 
Dario Lesca <d.lesca@xxxxxxxxxx>


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