SQL to find upper case words from a column

Question

I have a description column in my table and its values are:

This is a EXAMPLE
This is a TEST
This is a VALUE

I want to display only EXAMPLE

Answer 1

This should do the trick:

SELECT SUBSTR(REGEXP_REPLACE(' ' || REGEXP_REPLACE(description, '(^[A-Z]|[a-z]|[A-Z][a-z]+|[,])', ''), ' +', ' '), 2, 9999) AS only_upper
FROM ( 
    select 'Hey IF you do not know IT, This IS a test of UPPERCASE and IT, with good WILL and faith, Should BE fine to be SHOWN' description
    from dual 
)

I have added condition to strip commas, you can add inside that brakets other special characters to remove.

ONLY_UPPER
-----------------------------------
IF IT IS UPPERCASE IT WILL BE SHOWN