Problem Statement/Rationale

I'm using Mongo Compass to monitor the perfomance of a database, but the perfomance monitoring fails when a regular expression query is running.

The UI shows the following error:

Command "currentOp" returned error "Invalid regular expression: /(?i-mx:word)/m: Invalid group"

Steps to Reproduce

1. Run the following snippet in a mongosh terminal connected to a mongodb deployment:

db.coll.insertOne({});
db.coll.find({$where: function() { sleep(20000) }}).projection({re: BSONRegExp('^(?i)\\Qchho0842\\E')})

1. Open Compass and connect to the same deployment
2. Open Performance Monitor tab and notice the error popping up

Expected Results

The performance monitoring should keep working

Actual Results

The perfomance monitoring stops working until you reload the page (and crashes again if there is a new regex query).