Regular Expression for asp email address verification

In the previous article, we used the string SEARCH method to verify the asp email address. Some friends may prefer regular expressions. The corresponding code is also provided here.
Method 1
Copy codeThe Code is as follows:
Public Function ChkMail (ByVal Email)
Dim Rep, Pmail: ChkMail = True: Set Rep = New RegExp
Rep. pattern = "([. a-zA-Z0-9 _-]) {} @ ([a-zA-Z0-9 }(. ([a-zA-Z0-9]) {2,}) {} $"
Pmail = Rep. Test (Email): Set Rep = Nothing
If Not Pmail Then ChkMail = False
End Function

Email address verification 2
Copy codeThe Code is as follows:
<%
Function isemail (strng)
Isemail = false
Dim regEx, Match
Set regEx = New RegExp
RegEx. pattern = "^ w + (-w +) | (. w +) * @ [A-Za-z0-9] + ((. |-) [A-Za-z0-9] + )*. [A-Za-z0-9] + $"
RegEx. IgnoreCase = True
Set Match = regEx. Execute (strng)
If match. count then isemail = true
End Function
%>

Method 3
Copy codeThe Code is as follows:
Public Function IsEmail (ByVal PString)
Dim Plt, Pgt: Plt = False: Pgt = False
For x = 2 To Len (PString)-1
If Mid (PString, x, 1) = "@" Then Plt = True
If Mid (PString, x, 1) = "." And Plt = True Then Pgt = True
Next
If Plt = True And Pgt = True Then
IsEmail = True
Else
IsEmail = False
End if
End Function
%>

Let's take a look at how to verify the use of instance 1.
Copy codeThe Code is as follows:
If ChkMail (admin@jb51.net) = True Then
Response. Write "The format is correct"
Else
Response. Write "Incorrect format"
End If