PBR textures suffix syntax

Hi, I saw in an old video from Jerry, at about minute 43,

https://learn.bentley.com/app/VideoPlayer/LinkToIndividualCourse?LearningPathID=111389&CourseId=129607&MediaID=5018923

that you can automatically load all the textures of a PBR material using some syntax, a suffix after the texture name.

What is the right syntax for each PBR channel?

Thanks.