var RegExp_String = /d(b+)(d)/i;
//Match one d followed by one or more b's followed by one d
var arr = RegExp_String.exec('cdbBdbsbz');
for (i = 0; i < arr.length; i++)
document.write("arr[" + i + "] = " + arr[i] + "<br />");
/*
run:
arr[0] = dbBd
arr[1] = bB
arr[2] = d
*/