The database name I can use contains a
+. During setup Piwik tells me that's an invalid database name.
I don't follow the code perfectly, but it looks like it boils down to https://github.com/piwik/piwik/blob/7f375924db9328f20a0b7cb1e41397f2309b60a7/plugins/Installation/FormDatabaseSetup.php#L63
I'm going to try the regular expression
Thx! This is a bug and we probably should allow a
+ in database name