Database backup knowing only the prefix

[JoDrm]

Hello,

I find myself in a situation where I need to save a certain number of databases not tables without knowing their names beforehand.
However all databases are prefixed with a name that I know. Example: "plop_1, plop_2, plop_3 ...".

Databases are created autonomously by users. So I need to back them up regularly. I therefore cannot fill in the POSTGRES_DB parameter exhaustively.

Is there a way to fill in a PREFIX parameter somewhere? Is this a scenario that is covered by a configuration ?