Ignore with Regular Expression?

In taking a look at the 404 logs I see that there are many entries with various URLs all ending in “$CREATIVE_CSC_BEACON”. No clue what this thing is, Google didn’t show me any results on that one.

I thought I could probably use the “ignore all” function in some way with Regex to match all URLs that end with “$CREATIVE_CSC_BEACON”. However, I don’t seem to be able to get this to work.

I tried using .*/$CREATIVE_CSC_BEACON and then setting the action to ignore instead of redirect, and I made sure to turn regex on, but it doesn’t seem to work.

Can anyone help?