[Ervin]

var b1=a1.split(/\s\d{2}\.\d{2}\.\d{2}\s\d{2}\:\d{2}\s.+\sПравка\sip\sinf/);

for(var i = 0; i < b1.length; i++) {
   if(!b[i].replace(/\s/g, "")) {
      b1.splice(i, 1);
      i--;
   }
}