Vb RegEx Emails

[YoungFave]

Hello, I have this pattern now “\b[A-Z]{1}[a-z]{3}\S*@yandex.ru\b”

It works fine, but I want to specify it more.

I want to take emails in format: NortonJA@yandex.ru or AdamsMK1@yandex.ru

Big letter + some small letters + 2 big letters + digit optionally + @yandex.ru

[YoungFave]

Don’t know why, but pattern “\b[A-Z]{1}[a-z]{3}[A-Z]{2}\S*@yandex.ru\b” doesn’t catch SmithNT@yandex.ru

[YoungFave]

This pattern works

“\b[A-Z]{1}[a-z]{1,30}[A-Z]{2}[0-9]{0,1}\S*@polyus.com\b”