Problem Statement/Rationale

$regex item in query is kept as pattern in  query history. 'pattern' doesn't work.

The query needs to be kept without any change.

Steps to Reproduce

How could an engineer replicate the issue you’re reporting?

1. I created a query in the `Filter` window. The query contained a $regex key. the query works as expected.
2. I clicked on the clock icon and found the query in the 'Recents' list
3. The query in the list does not contain '$regex'. Instead there is 'pattern' (with the specified value) and 'options' (with empty string).
4. When clicking on this query, and applying it, no document is found.

Expected Results

There should be `$regex` in the recent query.

Actual Results

There is 'pattern' in the recent query, and this query doesn't retrieve any document.

Additional Notes

Any additional information that may be useful to include.