SQL> create user a identified by a;

User created.

SQL> grant dba to a;

Grant succeeded.

SQL> create table a.a as select * from dba_objects;

Table created.

SQL> quit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@my_machine mydb]$ expdp system schemas=a directory=DATA_PUMP_DIR dumpfile=a.dmp content=DATA_ONLY EXCLUDE=TABLE:"IN ('A')"

Export: Release 11.2.0.3.0 - Production on Wed Feb 28 18:36:24 2018

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Password:

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORA-39001: invalid argument value
ORA-39071: Value for EXCLUDE is badly formed.
ORA-00936: missing expression