title: How to filter out problems in VSCode based on text?
body: <p>I'm using VSCode 1.41.0 on Windows 10 x64.</p>
  
  <p>In my code (which is in a research language you've likely never heard of), there is a certain class of warning message I get a lot of in the Problems panel, and I want to ignore those messages. The text of the message varies a bit across instances, but it always contains the word "duplicate". How can I filter <strong>out</strong> problems containing "duplicate"? The text filter that already exists <strong>keeps</strong> problems containing the specified text, and I want the opposite.</p>
  
  <p>I tried <code>!duplicate</code> but it didn't seem to do anything.</p>