I created my own syntax file tailored to UVM log files, in which each line is formatted in the same way:
<msg severity> <path>(<line number>) @ <simulation time>: <hierarchy> [<id>] <message>
I defined the syntax without any "conceal", because by default the reader would want to see all the parts of all the messages.
However, I wonder if having broken up the line to different syntax constructs can be leveraged to allow some simple command to conceal and unconceal parts of the message.
For example if I have defined
syn region filepath start="\/" end="[^\(]\+" oneline
it would be awesome to be able to type something like
:conceal syn filepath
and have it be recognized because "filepath" is defined as a syntax.
Or better yet, conceal the type of syntax that's under the cursor.
Then later I would want to be able to undo it, in case I suddenly want to look at the file paths.