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if ($form{searchtype} eq "keyword") {  #check that what was filled in 
+the form was right
    if ($class =~ /keyword/) { #Check the class is type keyword
...
        }
    }
}

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if (($form{'searchtype'} eq "keyword") && ($class =~ /keyword/)
    && ($desc =~ /$form{'searchstring'}/i) && ($desc =~ /$form{'search
+price'}/)) { 
    print "$desc\n";
}