Pass Semi Colon Delimited Parameter To Stored Procedure

I have a table with the following structure:

Code:
[tabid] [int] IDENTITY(1,1) NOT NULL,
[tabname] [nvarchar](50) NULL,
[description] [nvarchar](50) NULL,
[url] [nvarchar](50) NULL,
[parent] [int] NULL,

[Code] ....

I wrote a stored procedure that takes a string of values, seperated by semicolon as parameter. The procedure is below;

Code:
ALTER PROCEDURE [dbo].[selectUserTabsByRoles]
@var varchar(max)
AS
BEGIN
SELECT distinct * from tbl_tabs
where ( PATINDEX('%'+left(@var,1)+'%', roles) > 0
or PATINDEX('%'+right(@var,1)+'%', roles) > 0 ) AND parent is null and tabstatus =1
ORDER BY tabposition
END

My problem is, when I pass a parameter like 1; it fetches all rows with roles having 1. But I realised that the last row in the sample data does not have 1 as roles, but rather 11.