Regular Expression Validator on address email in c#

Question

I need check if the address email is correct in markup of my aspx page.

The possible address email correct is :

Name(AndAnyNumber).Surname(AndAnyNumber)@march.com

And I have tried this RegularExpressionValidator :

  <asp:RegularExpressionValidator ID="retxtEmail" runat="server" 
     ControlToValidate="txtEmail"
     ErrorMessage="Not valid" Text="Not valid" Display="Dynamic" 
     ValidationExpression="^([a-z][a-z0-9]*\\.[a-z][a-z0-9]*@march\\.com)$"  
     SetFocusOnError="true" EnableClientScript="true"></asp:RegularExpressionValidator>

Withou success because for address email :

[email protected]

The return is Not valid, why ?

Can you please help me figure out the problem?

Thanks in advance.

Hm, curious, try "^([a-z][a-z0-9]*[.][a-z][a-z0-9]*@march[.]com)$" — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Mar 11, 2016 at 9:13
I guess it will be due to the double escaped backslash. You do need to escape the ., but try with just the single slash. If that still doesn't work (for example, if asp.net adds the second slash for you) try @WiktorStribiżew suggestion above to escape using [.]. — christophano
– christophano, Commented Mar 11, 2016 at 9:26

nithin · Accepted Answer · 2016-03-11 09:58:13Z

1

There is a problem in your regex.Replace your regex with this:

^([a-zA-Z]+[0-9]+\.[a-zA-Z0-9]+@march\.com)$

if numbers are not mandatory replace [0-9]+ with [0-9]*

edited Mar 11, 2016 at 9:58

answered Mar 11, 2016 at 9:14

nithin

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3 Comments

Alexander Derck Over a year ago

Then his email can start with a number, which he doesn't want

Wiktor Stribiżew Over a year ago

Your ^([a-zA-Z]+[0-9]+.[a-zA-Z0-9][email protected])$ regex now allows the user part and domain part without a dot.

christophano Over a year ago

This pattern doesn't match the provided example - not sure why it's been accepted?

CountZero · Accepted Answer · 2016-03-11 10:39:17Z

1

This regex has been tested as working using Regex Coach (a good free tool for writing regex's).

^[a-z][a-z0-9]*\.[a-z][a-z0-9]*@march\.com$

Issues are:

Using

No need for the capturing parentheses
Currently case sensitive. Email addresses tend not be be.
Double back slashes - this is what was causing issues for me though this might be ASP.NET thing

edited Mar 11, 2016 at 10:39

answered Mar 11, 2016 at 10:21

CountZero

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2 Comments

nithin Over a year ago

There must be a problem with your Tool.Regex is not working.

CountZero Over a year ago

No, the formatting on SO was eating characters. Neededed to change it to be a code snippit for it to include all charatcers. Code now fixed.

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