Split delimited string into rows

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CREATE FUNCTION [dbo].[list_to_table] (
            @list varchar(4000)
            )

RETURNS @tab TABLE (
            item int
            )

BEGIN

IF CHARINDEX(',',@list) = 0 or CHARINDEX(',',@list) is null
BEGIN
    INSERT INTO @tab (item) VALUES (@list);
    RETURN;
END

DECLARE @c_pos INT;
DECLARE @n_pos INT;
DECLARE @l_pos INt;

SET @c_pos = 0;
SET @n_pos = CHARINDEX(',',@list,@c_pos);

WHILE @n_pos < 0
BEGIN
    INSERT INTO @tab (item) VALUES (CAST(SUBSTRING(@list,@c_pos+1,@n_pos - @c_pos-1) as int));
    SET @c_pos = @n_pos;
    SET @l_pos = @n_pos;
    SET @n_pos = CHARINDEX(',',@list,@c_pos+1);
END;

INSERT INTO @tab (item) VALUES (CAST(SUBSTRING(@list,@l_pos+1,4000) as int));

RETURN;
END

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declare @string as nvarchar(4000)
select 
	r.value('@value','int') as Kategori
from (
	select cast(<A value = "'+ replace(@string,',','"/<>;A value = "')+ '">' as xml
	) as xml_str) xml_cte 
cross apply xml_str.nodes('/A') as x(r)