Oracle 11g Release 2

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create table mytable (existingfield varchar(500));
insert into mytable values('
\\BRRNAKCL12\Audiofiles22\1Year\Diogarfngal_ZZZZZZZZZ\2020\Aug\03\5249013\5249013-07-25-18-96572.cca');
1 rows affected

Alter table mytable add NewField varchar(500);
update mytable set NewField= '/location/TELEDATA/'||substr(replace(replace(existingfield,'\','/'),'.cca','.wav'),instr(replace(replace(existingfield,'\','/'),'.cca','.wav'),'/2020',1,1) + 1)
1 rows affected

select * from mytable;


EXISTINGFIELD
NEWFIELD



\BRRNAKCL12\Audiofiles22\1Year\Diogarfngal_ZZZZZZZZZ\2020\Aug\03\5249013\5249013-07-25-18-96572.cca
/location/TELEDATA/2020/Aug/03/5249013/5249013-07-25-18-96572.wav