DECLARE @str varchar(8000),@search_str varchar(10)
SELECT @str = 'abcefbpqbbpef',@search_str = 'bp'
SELECT CASE WHEN CHARINDEX(@search_str, @str) = 0 THEN 0
ELSE LEN(@str) - CHARINDEX(REVERSE(@search_str), REVERSE(@str)) - LEN(@search_str) + 2 END
/*
--
10
*/