How to extract Specific Numbers from String in SQL

Question

I am trying to extract the number present in a string in which the string comes in a different way. The String I receive and expected output is mentioned below.

PRODUCT_DESCRIPTION	EXPECTED PACK SIZE	CURRENT_RESULT
PRODUCT A 3 CHEESE SLICE 170 GM	170	3170
PRODUCT B SUGAR 1.3KG (CL)	1300	13
PRODUCT C CHEESE SLICES 12X156GM	156	12156
PRODUCT KETCHUP BOTTLE 200GM (CL)	200	200
PRODUCT KETCHUP 1.3KG (CL)	1300	13

I tried using below transformation in Snowflake SQL, but it is only extracting all the numerical literals from the string.

REGEXP_REPLACE(SPLIT_PART(UPPER(PRODUTC_DESCRIPTION),'GM',1),'[^[:digit:]]')

I need to run the code in Snowflake, Any help would be appreciated.

Thanks

Answer 1

Something like this might be helpful:

select PRODUTC_DESCRIPTION, 
TRIM( regexp_substr( PRODUTC_DESCRIPTION, '([\\.\\d ]*\\d+ *)((KG|K|GM))',1,1,'e')) as packsize_num,
TRIM( regexp_substr( PRODUTC_DESCRIPTION, '[\\.\\d ]*\\d+ *((KG|K|GM))',1,1,'e')) as packsize_unit,
IFF( packsize_unit IN ('K','KG'),  packsize_num * 1000, packsize_num  ) packsize
from values 
('PRODUCT A 3 CHEESE SLICE 170 GM'),
('PRODUCT B SUGAR 1.3KG (CL)'),
('PRODUCT C CHEESE SLICES 12X156GM'),
('PRODUCT KETCHUP BOTTLE 200GM (CL)'),
('PRODUCT KETCHUP 1.3KG (CL)') tmp(PRODUTC_DESCRIPTION);

+-----------------------------------+--------------+---------------+----------+
|        PRODUTC_DESCRIPTION        | PACKSIZE_NUM | PACKSIZE_UNIT | PACKSIZE |
+-----------------------------------+--------------+---------------+----------+
| PRODUCT A 3 CHEESE SLICE 170 GM   |          170 | GM            |      170 |
| PRODUCT B SUGAR 1.3KG (CL)        |          1.3 | KG            |    1,300 |
| PRODUCT C CHEESE SLICES 12X156GM  |          156 | GM            |      156 |
| PRODUCT KETCHUP BOTTLE 200GM (CL) |          200 | GM            |      200 |
| PRODUCT KETCHUP 1.3KG (CL)        |          1.3 | KG            |    1,300 |
+-----------------------------------+--------------+---------------+----------+