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regexp_replace and chr versus characterset

edited Jul 21, 2018 5:00AM in SQL Language (MOSC) 2 commentsAnswered

I'm moving from Oracle 11 to 12 and have hit on something I don't understand.

In my Oracle 11 database where NLS_CHARACTERSET=US7ASCII  I use regexp_replace and chr to clean up bad user input, as illustred by this simple query.

SELECT temp, REGEXP_REPLACE (temp, '[' || CHR (1) || '-' || CHR (31) || CHR (127) || '-' || CHR (255) || ']', '') temp_norm

FROM (SELECT 'DRAFTING-STAN' || CHR (9) || 'DARD' temp FROM DUAL)

Running this in Oracle 11 shows how TEMP gets properly cleaned up to DRAFTING-STANDARD (tab character is removed)

When I run this in Oracle 12 where NLS_CHARACTERSET=AL32UTF8  the replace is more aggressive.  The result for temp_norm is DRAFTINGSTANDARD  (tab

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