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Error creating Regular Expression Validator control

Error creating Regular Expression Validator control

Error creating Regular Expression Validator control

Happy Friday, colleagues!
Not so happy for yours truly... sad
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" 
    ControlToValidate="txtEmail1">Must be a valid Email address>

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!



RE: Error creating Regular Expression Validator control

but this ending parenthesis does not seem to have beginning parethesis:

RE: Error creating Regular Expression Validator control

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



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