Finding and removing non ascii characters from an Oracle Varchar2

Question

We are currently migrating one of our oracle databases to UTF8 and we have found a few records that are near the 4000 byte varchar limit. When we try and migrate these reco

Answer 1

If you use the ASCIISTR function to convert the Unicode to literals of the form \nnnn, you can then use REGEXP_REPLACE to strip those literals out, like so...

UPDATE table SET field = REGEXP_REPLACE(ASCIISTR(field), '\\[[:xdigit:]]{4}', '')

...where field and table are your field and table names respectively.