invalid back reference in regular expression

Solution ID:ORA-12727

Type: Oracle

Cause

A back references was found before a sub-expression.

Actions

Ensure a valid sub-expression is being referenced.

Try the following links for this error:


http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm


https://community.oracle.com/message/4006317


https://community.oracle.com/message/9884278


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