Get data between two second period and comma - sql

Question

I have an AWS server name and I am trying to just get the domain name.
Here is an example of the server name:
SERVER1.SERVER2.US-WEST-5.RDS.AMAZONAWS.COM,59642
I just want to return:
US-WEST-5.RDS.AMAZONAWS.COM
I have tried using something similar to this:
But that is only for semi-colons. I know it is nested substrings and charindexes,

Answer 1

You can try this using SUBSTRING (Transact-SQL)
.
Returns part of a character, binary, text, or image expression in SQL Server.
Syntax
SUBSTRING ( expression ,start , length )
Here is the implementation.
SELECT SUBSTRING('SERVER1.SERVER2.US-WEST-5.RDS.AMAZONAWS.COM,59642',
1, CHARINDEX(',', 'SERVER1.SERVER2.US-WEST-5.RDS.AMAZONAWS.COM,59642') - 1)
AS FirstPart
Here is the live db<>fiddle demo.

Answer 2

Just another option. Perhaps a little overkill, but it demonstrates how you can parse a delimited string into columns.
Example
Declare #YourTable table (ID int,SomeCol varchar(500))
Insert Into #YourTable values
(1,'SERVER1.SERVER2.US-WEST-5.RDS.AMAZONAWS.COM,59642')
,(2,'SERVER1.SERVER2.US-WEST-6.RDS.AMAZONAWS.COM') -- note no trailing ,
,(2,'SERVER1.SERVER2.US-WEST-6.RDS.DEV.AMAZONAWS.COM') -- note extra DEV ,
Select A.ID
,NewStr = concat(pos3,'.'+pos4,'.'+pos5,'.'+pos6,'.'+pos7,'.'+pos8,'.'+pos9)
From #YourTable A
Cross Apply ( values ( left(SomeCol,charindex(',',SomeCol+',')-1 ))) B(CleanString) -- Removes Trailing ,####
Cross Apply ( -- Parses CleanString on .
Select Pos1 = xDim.value('/x[1]','varchar(max)') -- Can be removed
,Pos2 = xDim.value('/x[2]','varchar(max)') -- Can be removed
,Pos3 = xDim.value('/x[3]','varchar(max)')
,Pos4 = xDim.value('/x[4]','varchar(max)')
,Pos5 = xDim.value('/x[5]','varchar(max)')
,Pos6 = xDim.value('/x[6]','varchar(max)')
,Pos7 = xDim.value('/x[7]','varchar(max)')
,Pos8 = xDim.value('/x[8]','varchar(max)')
,Pos9 = xDim.value('/x[9]','varchar(max)')
From ( values (cast('<x>' + replace(CleanString,'.','</x><x>')+'</x>' as xml))) as A(xDim)
) C
Returns
ID NewStr
1 US-WEST-5.RDS.AMAZONAWS.COM
2 US-WEST-6.RDS.AMAZONAWS.COM
2 US-WEST-6.RDS.DEV.AMAZONAWS.COM