While the new regex ^[^@\s]+@[^@\s]+\.[^@\s]+$ catches basic email formatting issues, it doesn't cover many valid edge cases defined in the RFC 5322 spec. For example, it allows invalid domains like @.com and fails to catch some invalid placements of dots, but disallows valid quoted local parts ("john.doe"@example.com), local parts with special characters (user+mailbox@example.com), or IP address literals (user@[192.168.1.1]).

For more robust validation, I recommend using one of the well-established regex patterns shared by emailregex.com.
You can also find a much more in-depth discussion of the topic of email validation using regex at regular-expressions.info.