jQuery algorythm

function $(a1,a11){
		var aR=[],aT={Id:/\#(\w*)/,ClassName:/\.(\w*)/},Lp=/\:(last|(\d*))/,Ld=0;
		for(i in a1.split(' ')){
			var a2=a1.split(' ')[i],aO=(!aR.length?document.body:aR[Ld]).getElementsByTagName(a2.match(/\w*/)[0]||'*'),Ld=Lp.exec(a2)?(Lp.exec(a2)[1]=='last'?aO.length-1:Lp.exec(a2)[1]-1):0;var aR=[];
 
			aJ:for(j=0;j<aO.length;j++){
				for(k in aT){if(aT[k].exec(a2)?aT[k].exec(a2)[1]!=aO[j][k.charAt(0).toLowerCase()+k.slice(1)]:0)continue aJ;}
				aR.push(aO[j]);
			}
		};
		if(Lp.exec(a2)&&Lp.exec(a2)[1])return aR[Lp.exec(a2)[1]=='last'?aR.length-1:Lp.exec(a2)[1]-1];
		return aR.length?(aR.length==1&&!a11?aR[0]:aR):undefined;
	}