Substring from right by character SQL - sql

Question

I have a string(s)-
CO_CS_SV_Integrate_WP_BalancingCostRiskandComplexityinYourDRStrat_Apr-Jun
Or
CO_CS_SV_CommVaultTapSponsorship_WP_GartnerNewsletterSmartIdeaforBigData_Jan-Mar
Or
CO_CS_IA_eMedia_WP_Top5eDiscoveryChallengesSolved_Apr-Jun
I need to get the asset name associated with the campaign which is in the campaign name.
So for example "Balancing Cost Risk and Complexity in Your DR Strat"
would be the asset associated with the first campaign-
"CO_CS_SV_Integrate_WP_BalancingCostRiskandComplexityinYourDRStrat_Apr-Jun"
That is my goal. I want to get just that from the string ("Balancing Cost Risk and Complexity in Your DR Strat".
But I don't see how to strip out the asset from the campaign name. It is not consistent on position or anything else???
I think I can go from the right and and find the second "_"
But I don't know the syntax. I get as far as -
select campaign.name
,Right (campaign.name, charindex('_', REVERSE(campaign.name))) as Test
from campaign
which gives me -
_Apr-Jun
Any help or direction would be greatly appreciated
Thanks.

Answer 1

You could create a scalar function that accept the string, like the following:
CREATE FUNCTION myFunction
(
#str varchar(300)
)
RETURNS varchar(300)
AS
BEGIN
declare #reverse varchar(200),#idx1 int,#idx2 int
set #reverse = reverse(#str)
set #idx1 = CHARINDEX('_',#reverse)
set #idx2 = CHARINDEX('_',#reverse,#idx1+1)
return reverse(substring(#reverse,#idx1+1,#idx2-#idx1-1))
END
You can try with the following example:
select dbo.myFunction('CO_CS_SV_Integrate_WP_BalancingCostRiskandComplexityinYourDRStrat_Apr-Jun');