--This function returns the "value" of a RegionsOfInterest string,
--given a keyword and a string to search.  For example,
--'{"Suffix":"_ROI Period 1","Start":-1,"End":1,"IsEnabled":true,"IsDefault":true,"ChannelNames":["an1","an2","an3"]}'
--and 'Start' returns -1
CREATE FUNCTION [dbo].[foo_ROIStringToValueString]
(
	@RemainingSubString nvarchar(Max)
	,@KeyWord nvarchar(255)
	,@ValueTerminator char
)
RETURNS nvarchar(MAX)
AS
BEGIN
	DECLARE @KeywordStartIndex INT
	DECLARE @ValueLen INT
	DECLARE @ValueString nvarchar(MAX)

	SET @KeywordStartIndex = CHARINDEX(@KeyWord, @RemainingSubString) + LEN(@KeyWord)
	SET @RemainingSubString = SUBSTRING(@RemainingSubString, @KeywordStartIndex, CHARINDEX('}', @RemainingSubString) + 0)
	SET @ValueLen = CHARINDEX(@ValueTerminator, @RemainingSubString) - 1
	IF (@ValueLen = 0)
	BEGIN
		SET @ValueString = ''
	END
	ELSE
	BEGIN
		SET @ValueString = SUBSTRING(@RemainingSubString, 1, @ValueLen)
	END

	RETURN @ValueString
END