Extracting month using substring in sql server - sql-server

Question

I have the following code
#FiscalMonth As varchar(MAX) ='[Dim Date].[Fiscal].[Fiscal Month Number].&[10]&[2014]&[4]&[1]'
In my case the month will be 10 . I have tried the following code
SET #FiscalMonthNumber = cast(substring(right(#FiscalMonth,18),1,2) as nvarchar(max))
The code above works fine but when I have
#FiscalMonth As varchar(MAX) ='[Dim Date].[Fiscal].[Fiscal Month Number].&[10]&[2014]&[11]&[1]'
I have as result 0] which is incorrect .

Answer 1

Ugh. This assumes that the first time you encounter a pattern like '[n' (where n is any number, and it will occur within the first 8000 characters of the string), that is the month:
DECLARE #fm VARCHAR(MAX);
SET #fm = '[Dim Date].[Fiscal].[Fiscal Month Number].&[10]&[2014]&[4]&[1]';
SELECT SUBSTRING(#fm, PATINDEX('%[[][0-9]%', #fm) + 1,
CHARINDEX(']', SUBSTRING(#fm, PATINDEX('%[[][0-9]%', #fm) + 1, 8000)) - 1);
Result:
----------
10
If there are other possible patterns or edge cases, make them known.
SQLfiddle demo

Answer 2

I have checked your code it is working fine it is showing 10 in both cases maybe you need to look into you logic.
DECLARE #FiscalMonth varchar(MAX) ='[Dim Date].[Fiscal].[Fiscal Month Number].&[10]&[2014]&[4]&[1]'
DECLARE #FiscalMonthNumber nvarchar(max) = cast(substring(right(#FiscalMonth,18),1,2) as nvarchar(max))
SELECT #FiscalMonthNumber
DECLARE #FiscalMonth1 As varchar(MAX) ='[Dim Date].[Fiscal].[Fiscal Month Number].&[10]&[2014]&[4]&[1]'
DECLARE #FiscalMonthNumber1 AS nvarchar(max) = cast(substring(right(#FiscalMonth,18),1,2) as nvarchar(max))
SELECT #FiscalMonthNumber1

Answer 3

Or you can extract all the numbers from you string and then extract the month number from your number string. something like this
DECLARE #FiscalMonth1 As varchar(MAX) ='[Dim Date].[Fiscal].[Fiscal Month Number].&[10]&[2014]&[4]&[1]'
WHILE PATINDEX('%[^0-9]%',#FiscalMonth1) <> 0
SET #FiscalMonth1 = STUFF(#FiscalMonth1,PATINDEX('%[^0-9]%',#FiscalMonth1),1,'')
SELECT LEFT(#FiscalMonth1, 2)