Excluding schema from backup

[Stéphane Schildknecht <stephane.schildknecht@xxxxxxxxxxxxxxxx>]

Hi all,

I tried the knewly introduced feature allowing one to exclude a schema
from a backup with pg_dump, but I got a
really strange error :

pg_dump -U postgres MYDB -N "_MYDB" gives me a dump including that schema.

I then tried pg_dump -U postgres MYDB -n "_MYDB" and then got "pg_dump:
No matching schemas were found"

Dumping the only public schema works. But, by doing so, I miss some
other schema I really need.

Is there a limitation I didn't catch ?

Thanks by advance.

Stéphane Schildknecht