Search footage and replace script

I´m looking for a script that allows me to create different versions of the same project relying in naming conventions.

Say my comp has 3 clips, video_1_AA , video2_AA, video_3_AA. I´d like to update the three of them with videos 1, 2 and 3 BB, CC or whichever I need, relying in the last two characters of the name files being the rest of the name the same.

Is this possible or simple to do for a newbie?

Thanks!