Finding rows that don't contain numeric data in Oracle

Question

I am trying to locate some problematic records in a very large Oracle table. The column should contain all numeric data even though it is a varchar2 column. I need to find

Answer 1

After doing some testing, building upon the suggestions in the previous answers, there seem to be two usable solutions.

Method 1 is fastest, but less powerful in terms of matching more complex patterns.
Method 2 is more flexible, but slower.

Method 1 - fastest
I've tested this method on a table with 1 million rows.
It seems to be 3.8 times faster than the regex solutions.
The 0-replacement solves the issue that 0 is mapped to a space, and does not seem to slow down the query.

SELECT *
FROM 
WHERE TRANSLATE(replace(,'0',''),'0123456789',' ') IS NOT NULL;


Method 2 - slower, but more flexible

I've compared the speed of putting the negation inside or outside the regex statement. Both are equally slower than the translate-solution. As a result, @ciuly's approach seems most sensible when using regex.

SELECT *
FROM 
WHERE NOT REGEXP_LIKE(, '^[0-9]+$');

                                                        

              
                
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