Allow only one special charecter in email validation vb.net windows form

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Hi All
I have the following code

VB

Function EmailAddressCheck(ByVal emailAddress As String) As Boolean
      Dim pattern As String = "^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$"
      Dim emailAddressMatch As Match = Regex.Match(emailAddress, pattern)
      If emailAddressMatch.Success Then
          EmailAddressCheck = True
      Else
          EmailAddressCheck = False
      End If
  End Function

where I have to allow ' character to email.What should I do? Please help

Posted 4-Mar-11 1:48am

IndrajitDasgupat

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Piccadilly Yum Yum · Answer 1 · 2011-03-04T02:26:00

Solution 1

Effective Email Address Validation[^]

Posted 4-Mar-11 2:26am

Piccadilly Yum Yum

IndrajitDasgupat · Answer 2 · 2011-03-04T02:50:00

VB

Try this on.
^\w+([-+.']\w+)*@\w+([-.']\w+)*\.\w+([-.]\w+)*$

VB

Function EmailAddressCheck(ByVal emailAddress As String) As Boolean
      Dim pattern As String = "^\w+([-+.']\w+)*@\w+([-.']\w+)*\.\w+([-.]\w+)*$"
      Dim emailAddressMatch As Match = Regex.Match(emailAddress, pattern)
      If emailAddressMatch.Success Then
          EmailAddressCheck = True
      Else
          EmailAddressCheck = False
      End If
  End Function