improved connection detection

ServerStart.sh.template

@@ -17,7 +17,7 @@ while true; do
         echo "0" > /home/minecraft/scripts/lp_shutdown
         mcconn=0
         until [ $mcconn -ne 0 ]; do
-            mcconn=$(nc -l 25500 | cat -v | grep -cF '^@cM-^\^B')
+            mcconn=$(nc -l 25500 | cat -v | grep -czP '(\^X\^@M-r\^E\^Q)([\w\.]+)(\^@FML2\^@cM-\^\\\^B\n\^@\^H)([\w\.]+)')
             if [ $mcconn -eq 0 ]; then
                 echo "Something connected, but it doesn't look like a minecraft connection"
             else