Create below stored procedure in your database. It will helpful to you in future also.

EXEC Searchinall 'TextSpName'    

CREATE PROCEDURE [dbo].[Searchinall] 
    (@strFind AS VARCHAR(MAX))
    AS
    BEGIN
        SET NOCOUNT ON; 
        --to find string in all procedures        
        BEGIN
            SELECT OBJECT_NAME(OBJECT_ID) SP_Name,
                   OBJECT_DEFINITION(OBJECT_ID) SP_Definition
            FROM   sys.procedures
            WHERE  OBJECT_DEFINITION(OBJECT_ID) LIKE '%' + @strFind + '%'
        END
    END

It will provide all matched store procedure list, which contains/using given keyword. TextSpName