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user input question

Okay I see what you're saying.  The user can add his
own queries in $hash and I'll be exacuting their query
along with mine.  Do they need a space?  I could add
this to the top of the script:

// Is there a ' ' in $hash?
if (preg_match("<\s>", $hash) > 0) {
 echo " <p>That is not a correctly formed hash. 
<b>Please try again.</b></p>
     <a href=$linkback>Click here to return to the
main page.</a>";

It will kick 'em out before anything else gets done. 
What do you think?

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