Error creating Regular Expression Validator control 1

[IlyaRabyy]

Happy Friday, colleagues!
Not so happy for yours truly...
Subject line says what the problem I have. Here's the code (exactly as in the book "Murach's ASP.NET 4.6 Web Programming with C# 2015", pg. 271, fig. 7-13):

<asp:RegularExpressionValidator ID="revEmail1" runat="server" ErrorMessage="Email address" CssClass="text-danger" Display="Dynamic" 
     ValidationExpression="[COLOR=#CC0000][b]\w([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.])\w+)*[/b][/color]" 
    ControlToValidate="txtEmail1">Must be a valid Email address>
</asp:RegularExpressionValidator>

Let alone it's hard not to screw up typing this expression (in bold, red), but VS tells me... well, picture (Design screen) worth 1K words:

I check all chars in this regex 3 times - exact match to the one in the book, so...
Where do I err?
Please advise!
AHWBGA!

Regards,

Ilya

 

[mikrom]

but this ending parenthesis does not seem to have beginning parethesis:
\w([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.])\w+[highlight #FCE94F])[/highlight]*

 

[IlyaRabyy]

Right!
It turns out that it's a typo in the book. I added this opening parenthesis in front - and it worked.
Thank you!

Regards,

Ilya