It worked in this scene I made. You could use a regex with the match (http://help.autodesk.com/cloudhelp/2017/ENU/Maya-Tech-Docs/Commands/match.html)command to find the suffix and convert that to...

It would simply be a case of selecting all the cameras and saving that list to a variable. Using a "for loop", you can cycle through the camera list and grab their position in 3D space and use those...