How to find specific VALUE to specific STRING location in different strings

Question

I have a sting like this
,x,x,y,x,x,O,x,y
that matches to its values in an other sting like this
0~1~b~~z~XY~1~7.
The value \"O\" can switch its position in

Answer 1

Grab a copy of DelimitedSplit8K then you can do this:

DECLARE @string1 VARCHAR(1000) = ',x,x,y,x,x,O,x,y',
        @string2 VARCHAR(1000) = '0~1~b~~z~XY~1~7';

DECLARE @search VARCHAR(1000) = 'O'; -- best as a variable/parameter

SELECT *
FROM dbo.delimitedSplit8K(@string2,'~') AS s
WHERE s.itemNumber = 
(
  SELECT TOP (1) s2.itemNumber -- TOP (1) until we know about dupicates
  FROM   dbo.delimitedSplit8K(@string1,',') AS s2
  WHERE  s2.item = @search
)-1;

Returns:

ItemNumber           Item
-------------------- -------
6                    XY