ImageJ shift RoiSet numbering : rename your ROIs first 4 numbers (the xxxx in your ROI xxxx-yyyy-zzzz) by shifting the numbering according to value giver in the Dialog. Useful for ROIs generated on a stack that was not yet complete and some images have been appended to the beginning of the stack later on.

shift RoiSet numbering.ijm

// licensed CC BY-NC-SA Florian Wernert

macro "shift RoiSet numbering" {

	roiManager("select", 0);
	roi1_name = split(Roi.getName(), "-");
	min_val = -1* (parseInt(roi1_name[0]) - 1);
	max_val = pow(2, 16);
	
	
	Dialog.create("By how many do you want to shift");
	Dialog.addSlider("Shift by :", min_val , max_val, 0);
	Dialog.show();
	
	shift_n = Dialog.getNumber();
	print(shift_n);
	
	n = roiManager('count');
	for (i = 0; i < n; i++) {
	    roiManager('select', i);
	    rn = Roi.getName();
	    tokens = split(rn, "-");
	    rn1 = tokens[0];
	    new_rn1 = IJ.pad(toString(parseInt(rn1) + shift_n), 4);
	    new_roiName = new_rn1 + "-" + tokens[1] + "-" + tokens[2] + "-" + tokens[3] + "-" + tokens[4];
	    print(rn + " becomes " + new_roiName);
	    roiManager("rename", new_roiName);
	
	}
}