0 - 4 of 4 tags for regular expression

Hi,
I have a requirement to match the pattern and extract the word as explained below.
Ex: Column value  = "A_B_C.D_E_F NOT NULL HAVING COUNT EQ 0 SAMPLE A_B_C.H_I_J"

 I tested TD14.0 regex this was an unexpected result:

Hi guys, 
Please give me some help if you know the answer:
In the regex pattern below, the code should return HELLO instead of HELLO23 if the non-greedy version of \d{3,}? works, but it didn't work that.   can anyone show me how to do non-greedy pattern on TD14.
SELECT 'HELLO23456' AS ADDR,

Hi,
 
I am trying to call for REGEXP_INSTR , but despite being on :
InfoKey,InfoData
RELEASE,14.00.04.08
LANGUAGE SUPPORT MODE,Standard
VERSION,14.00.04.07
I am getting 5589 error telling that REGEXP_INSTR function does not exist?
fyi, REGEXP_SUBSTR is calle without trouble.