Regular Expressions Oracle PLSQL

SQL> create table TestTable(
  2    ID                    VARCHAR2(4 BYTE)         NOT NULL,
  3    Description           VARCHAR2(30 BYTE)
  4  )
  5  /
Table created.
SQL>
SQL>
SQL> insert into TestTable (ID, Description) values('1','1234 5th Street');
1 row created.
SQL> insert into TestTable (ID, Description) values('2','1 Culloden Street');
1 row created.
SQL> insert into TestTable (ID, Description) values('3','1234 Road');
1 row created.
SQL> insert into TestTable (ID, Description) values('4','33 Thrid Road');
1 row created.
SQL> insert into TestTable (ID, Description) values('5','One than another');
1 row created.
SQL> insert into TestTable (ID, Description) values('6','2003 Movie');
1 row created.
SQL> insert into TestTable (ID, Description) values('7','Start With Letters');
1 row created.
SQL>
SQL> select * from TestTable;
ID   DESCRIPTION
---- ------------------------------
1    1234 5th Street
2    1 Culloden Street
3    1234 Road
4    33 Thrid Road
5    One than another
6    2003 Movie
7    Start With Letters
7 rows selected.
SQL>
SQL>
SQL> SELECT description, REGEXP_INSTR(description,'[:lower:]')
  2  FROM testTable
  3  WHERE REGEXP_INSTR(description,'[:lower:]') > 0;
DESCRIPTION                    REGEXP_INSTR(DESCRIPTION,'[:LOWER:]')
------------------------------ -------------------------------------
1234 5th Street                                                   12
1 Culloden Street                                                  5
1234 Road                                                          7
33 Thrid Road                                                      6
One than another                                                   3
2003 Movie                                                         7
Start With Letters                                                 4
7 rows selected.
SQL>
SQL>
SQL> drop table TestTable;
Table dropped.
SQL>
SQL>