Updateing specific characters (URGENT)

Question

THe given below is my table and i want to replace ST in address column with STREET in address_form column. but the problem is this that i dont want to replace ST from STUART to STREETUART. I used the given below query and i got the output as given in table 2. i want the output as given in table 1
UPDATE A SET ADDRESS_FORM=REPLACE(ADDRESS,' ST', 'STREET')
TABLE 1
ADDRESS ADDRESS_FROM
68 AUSTRAL ST 68 AUSTRAL STREET
GREAT EASTERN ST GREAT EASTERN STREET
NTH STUART ST NTH STUART STREET
TABLE 2
ADDRESS ADDRESS_FROM
68 AUSTRAL ST 68 AUSTRAL STREET
GREAT EASTERN ST GREAT EASTERN STREET
NTH STUART ST NTH STREETUART STREET

Answer 1

WITH these queries i am getting the output given below. hope you will get it
SELECT IDX,address,REPLACE(REPLACE(ADDRESS_form,' ST +',' STREET '),' ST$',' STREET') ADDRESS_form
FROM TEMP_AU_POI_INTERM where instr(address_form, ' ST') > 0;
SELECT IDX,address,RTRIM(REPLACE(ADDRESS_form,' ST +|ST$',' STREET ')) ADDRESS_form FROM TEMP_AU_POI_INTERM where instr(address_form, ' ST') > 0
and instr(address_form, ' STREET') = 0;
SELECT IDX,ADDRESS,RTRIM(REPLACE(ADDRESS_FORM,'ST( +|$)','STREET\1'))
FROM TEMP_AU_POI_INTERM where instr(address_form, ' ST') > 0
and instr(address_form, ' STREET') = 0;
OUTPUT
COWPER ST     COWPER ST
410 CAMPBELL ST     410 CAMPBELL ST
CNR ECHUCA ST     CNR ECHUCA ST
130 HIGH ST     130 HIGH ST
while i want to replace them aslo to STREET