Assuming nextindexstr is required, the following result was found.
the functions instead and is clearer for me personally to understand: // I want 010 v_NextIndex = 10; // yields 10 v_NextIndexStr = v_NextIndex.leftpad(3); // yields " 10" v_NextIndexStr = v_NextIndex.leftpad(3).replaceAll(" ", "0"); // yields "010"...