OT: simple regex question

[Matt Davey]

On Mon, 2007-04-23 at 11:41 +0200, Dario Lesca wrote:
> 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?

will you accept perl?  I'm sure this could be neater, but I'm a bit
rusty:

echo "aa bb cc dd" | perl -pe 'exit(!(/(?=.*bb)(?=.*aa)/));'
    && echo found

Matt

Matt Davey		When I read about the evils of drinking, I gave 
mcdavey at mrao.cam.ac.uk 	     up reading.  - Henny Youngman.