Validate format of input

[adityapadhi]

Hi All,

Have written an API proxy that accepts two query parameters.

1st query param is 'code'

2nd query param is 'id'

The query parameter 'id' has fixed format based on value of 'code'

code	Format for id
AT	1 block of 9 characters
BE	1 block of 10 digits

How do I check format of 'id' based on code?

Here is few concrete examples of what am trying to achieve.

/verify?code=AT&id=123	{"errorCode": 1001, "errorCode": "Invalid parameter"}
/verify?code=AT&id=12311BBcd	pass through
/verify?code=BE&id=12345678AA	{"errorCode": 1001, "errorCode": "Invalid parameter"}
/verify?code=BE&id=1234567890	pass through

There are 22 codes and each code have specific format. Most are simple format check, some are a bit complex.

What's the best way to achieve this?

Thanks in advance.