Using regexp_replace in update

Question

I have a db column report_name which will have values similar to this

000007091_PaymentRegisterReport _D x3A 975844_2012-12-26.XLS

I need to delete the space before _D in all PaymentRegisterReport with XLS extension. Could somebody help me with the regex to use inside regexp_replace function in the update statement?

Answer 1

Do you really need a regex to update the data? Please check the query.

update TableName
set report_name=REPLACE(report_name, ' _D' , '_D')
WHERE report_name LIKE '%PaymentRegisterReport %' AND 
  report_name LIKE '%.XLS';

Answer 2

The expression that you need to use is

REGEXP_REPLACE(f1, '(.*)(_PaymentRegisterReport) _D (.*)(\.XLS)$', '\1\2_D\3\4')

I am assuming that you can identify the report type by 'PaymentRegisterReport' and the file extensions will be in uppercase

Answer 3

You can replace the " _D" bi "_D" with a select as said techdo.

But I wrote a regex_replace as you was asking :

select regexp_replace('000007091_PaymentRegisterReport _D x3A 975844_2012-12-26.XLS','^(.*) _D(.*).XLS$','\1_D\2.XLS') from dual;