private void addRowToSearchString(StringBuilder sb, int previewColumnIndex, int j) {
		InstructionTableDataObject obj =
			(InstructionTableDataObject) this.getModel().getValueAt(j, previewColumnIndex);
		String preview = obj.getData();
		if (preview != null) {
			sb.append(preview);
		}
	}
Gathers the search strings for each instruction and returns them as a
single string.

@return the complete search string
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/instructionsearch/ui/PreviewTable.java