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var pattern=/([a-z])([0-9])([A-Z])/g;
var data="a1AWWWWWWb2B";
data.replace(pattern,function($0,$1,$2,$3){
var s="$0:"+$0+";$1:"+$1+";$2:"+$2+";$3:"+$3;
document.write(s+"<br>");
});
$0:a1A;$1:a;$2:1;$3:A
$0:b2B;$1:b;$2:2;$3:B