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//builds a regex and splits by it from array of strings.
function buildsplitexp(arr) {
	var regex = "(";
	for(var i=0;i<arr.length;i++) {
		var temp = arr[i].split("");
		for(var j=0;j<temp.length;j++) {
			regex += "\\" + temp[j];
		}
		regex += ")|(";
	}
	regex = regex.slice(0, regex.length-2);
	return new RegExp(regex);
}