(file1.txt|file2.bmp|file3.mkv)
You can use the same pattern in Tools > Find Files without having to run any commands. (Make sure wildcards are turned on for the Name field at the top.)
If the list of files is too long for a single pattern, switch to Advanced mode and it will let you add multiple patterns.
On the other hand, if you do want to use commands, here's how: How to use buttons and scripts from this forum
Also, if you need to do this a lot with a different list each time, a script could be written to do that so you don't have to make the pattern yourself each time. Not worth doing if it's a one-off or rare job (or the list isn't very long), but could save a lot of time if you do it a lot and the lists are large, and we could help with that.