$TMP = "asdf";
$search = 'command';
$string = '`command -option $TMP`';
$string =~ /(`$search([^`]*)`)/ ;
$match = $1;

print "erkannter String: $match \n";
print (($string =~ m/($match)/ ) ?  "Regexp-Match: $1\n" : "kein Match\n");