REGEXP_REPLACE('H1234 H4321 H2345','(.*) (.*) (.*)','\3, \2 \1')
SQL> --For a better example of using backreference, let's suppose we wanted to convert a
name in the form "first middle last" into the "last, middle first" format. Consider this command:
SQL>
SQL> SELECT REGEXP_REPLACE('H1234 H4321 H2345','(.*) (.*) (.*)','\3, \2 \1')FROM dual;
REGEXP_REPLACE('H1
------------------
H2345, H4321 H1234
SQL>
SQL>
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