Add query regex filtering to metadata custom data

[jp-espresso]

Is your feature request related to a problem? Please describe.

Our application uses randomly generated IDs for the room ID as we're associating rooms with different documents rather than using the file name as an unique identifier. Currently the query regex filtering only exists on roomId and not on the metadata where we store the actual file name.

Describe the solution you'd like

We would like to see the query filtering have the ability for regex matching in the metadata attributes.