I need to block calls that they start with number 0.
i did this, but it`s not OK:
if (uri=~"^sip:[1-9]*@.*") {
   rewritehost("10.0.0.10");
   log("access ok");
   route(1);
   break;
};

if (uri=~"^sip:0[1-9]*@.*") {
   log("access deny");
   break;
};

How can i do this?