The regex is: .+\.(?!br|com|net|org)

If you're just using () for grouping, 

  .+\.(?:br|com|net|org)

[download]
might serve you better, though that's a pretty heavy-handed way to deal with your email.

In reply to Re: Email suffix matching with a negative look-ahead regexp by dws
in thread Email suffix matching with a negative look-ahead regexp by jxz

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