One way would be to just include just the part of the text that appears in all of the possible descriptions (in your example “ABCx”) in your Descriptions Contains column.
If that doesn’t work, then you’ll likely have to jump into creating a “Description Regex” column, and using “Regular Expressions” to describe what you want to do. Here’s a thread that talks about it, there are others as well if you search the forum. It’s a very powerful command, but not so intuitive, so you may have to play around with it for a while before you come up with something that does exactly what you need.