[RESOLVED] VB.NET regex validation differs from Javascript

Given the following codes and my input is new@[email protected]
this one returns false

VB.NET Code:

<asp:RegularExpressionValidator
     ID="REV1"
     runat="server"
     Display="Static"
     ErrorMessage="Error." 
     ControlToValidate="txtEmailAdd"
     ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" />

but this one returns true

VB.NET Code:

Dim myMatch As Match = System.Text.RegularExpressions.Regex.Match(txtEmailAdd.Text, "\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*")
If Not myMatch.Success Then
    Result.Text = "Error."
    Exit Sub
End If

can anyone tell me what's wrong? Thanks in advance.

Hey,

The regular expression that you are using is only matching the domain of the email. You can see this if you run a test here:

http://gskinner.com/RegExr/

The second one works because you are looking for a "match" within new@[email protected], and it is finding one. However, your RegularExpressionValidator is trying to match the entire string that you give, it, and that isn't what you are testing for.

Gary

Thanks for the info. Appreciated it =)

so what will I change in my RegularExpression to match the validation from what i have in my RegularExpressionValidator?

Hold on, hold on, hold on....

The regular expresssion that you have is valid, in a sense, what you are putting into the TextBox is wrong.

Code:

---

new@[email protected]

---

Is not a valid email address. You have two @'s, so the RegularExpressionValidator is correct to fail it.

Gary

let me revise my question.

what should I change on my code-behind codes to correct the validation in order for it to be the same as the validation of my RegularExpressionValidator?

Hey,

I would change the Regular Expression to match only if the entire regular expression matches, either using a word boundary:

http://www.regular-expressions.info/wordboundaries.html

Or anchors:

http://www.regular-expressions.info/anchors.html

In your case, I think anchors make the most sense.

Hope that helps!!

Gary

The codebehind is matching on the bold part:

nav@[email protected]

Which is why you're getting bad results.

You can get a regex for email addresses here:

http://www.regular-expressions.info/email.html


So for example, try this:

^([0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$



With the above regex you should get closer to matching properly

thanks gep13 and mendhak! =)
its been a great help! ive been able to validate it correctly. thanks thanks!!

Hey,

Out of interest, what was your final implementation?

Gary