Extra data validation in Supplier registration form

Summary:

Hi

I want to add extra condition on highlighted attribute field#ISN . This is Redwood Supplier registration page.

All the ISN numbers are formatted as 400-XXXXXX (6-digits)

below condition need to add -

ISN# should start with a 3-digit number, which must be a value of either “100”, “200”, “300” or “400”, followed by a “-“, followed by a 6- or 7-digit number.

If user add something then warning should come up.

Can you please guide on this

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