Is There A Way to Make Regex Case Insensitive With JQuery.Validate.Unobtrusive?

Question

I am using .NET Core's client side validation to validate user input based on a regular expression.

The following is a regular expression that accepts 3 letters 'AAA' and 7 digits:

data-val-regex-pattern="^AAA\d{7}\b"

I want to make it case insensitive, so the user can type 'AAA' or 'aaa' and get the same result, but cannot find a way to do so.

I have tried:

1. Changing the regex to ^(?i)AAA\d{7}\b
2. Changing the regex to /^AAA\d{7}\b/i
3. Using | to check multiple expressions, one upper and one lower case.

But nothing has worked.

Can anyone please explain how to make an unobtrusive JavaScript regex case insensitive?

Answer 1

This regex should match the stated criteria: ^[A-Za-z]{3}\d{7}\b

Can you provide some example data of what should and shouldn't be matched to confirm?

Great explanation of the pattern courtesy of RegEx101: