Validating string format using sql server -


check if string following correct format or not. correct format follows:

2 upper case letters; 2 digits; 1 30 characters alpha-numerical (case insensitive) e.g. gb29rbos60161331926819, gb29rbos60161331926819a, gb29rbos60161331926819b1

so far have got... 

declare @accountnumber varchar(1000) = 'gb99aerf12fdg8aerf12fdg8aerf12fdg8'  select  case when @accountnumber not '[a-z][a-z][0-9][0-9][0-9a-za-z]{30}$'  'error' else null end

first, structure assumes case sensitive collation. second, sql server doesn't recognize {} or $, have repeat pattern. however, want 30 characters, splitting pieces apart best solution:

select (case when len(@accountnumber) not between 5 , 34 or                   @accountnumber not '[a-z][a-z][0-9][0-9]%' or                   right(@accountnumber, 34) '%[^a-za-z0-9]%'              'error'          end)

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