ASP判断邮箱的合法性函数（比较好用）

函数名：chk_Email()

‘返回值：布尔值（True为通过，False为未通过）

‘参数：email(需要判断的email，类型：字符串)?? Type_1(是否需要判断@之后的domain，类型：布尔值)

‘Type_2(是否只能是特定域的E-Mail注册，类型：布尔值) Type_3(一个E-Mail是否只能注册一次，类型：布尔值)

Const C_maildomain=".com,.com.cn,.net,.net.cn,.org,.org.cn,.gov,.gov.cn,.edu,.edu.cn,.cn,.cc,.biz,.info" '电子邮件可接受的domain


Const C_Lockdomain="bit.edu.cn,loster.org" '特定的域

Function chk_Email(email,Type_1,Type_2,Type_3)
 Dim i,k
 Dim At
 Dim Email_1,Temp

 If email="" Then
  chk_Email=False
  Exit Function
 End If

 Email_1=Cstr(trim(email))

 If Len(Email_1)<5 Then
  chk_Email=False
  Exit Function
 End If

 At=False

 For i=1 To Len(Email_1)
  Temp=Mid(Email_1,i,1)
  If Temp="@" Then
   at=True
   Exit For
  End If
 Next

 If At=False Then
  Chk_Email=False
  Exit Function
 End If
 
 k=0

 For i=1 To Len(Email_1)
  Temp=Mid(Email_1,i,1)
  If Temp="." then
   k=k+1
  End If
 Next

 If k=0 Or k>2 Then
  Chk_Email=False
  Exit Function
 End If

 
 If Type_1=True Then

 For i=1 To Len(Email_1)
  Temp=Mid(Email_1,i,1)
  If Temp="@" Then
   k=i
   Exit For
  End If
 Next
 
 For i=k To Len(Email_1)
  Temp=Mid(Email_1,i,1)
   If Temp="." Then
    k=i
    Exit For
   End If
 Next

 Temp=""

 For i=k To Len(Email_1)
  Temp=Temp+Mid(Email_1,i,1)
 Next

 Temp=Cstr(Trim(Temp))
 At=False

 For i=0 To R_Reader(C_Maildomain,",")
  If Temp=Reader(i) Then
   At=True
   Exit For
  End If
 Next
 
 Erase Reader

 If At=False Then
  Chk_Email=False
  Exit Function
 End If
 
 End If

 If Type_2=True Then
  For i=1 To Len(Email_1)
   Temp=Mid(Email_1,i,1)
   If Temp="@" Then
    k=i
    Exit For
   End If
  Next

  Temp=""

  For i=k+1 To Len(Email_1)
   Temp=Temp+Mid(Email_1,i,1)
  Next

  Temp=Cstr(Trim(Temp))
  
  At=False
  For i=0 To R_Reader(C_Lockdomain,",")
   If Temp=Reader(i) Then
    At=True
    Exit For
   End If
  Next
   
   Erase Reader

  If At=False Then
   Chk_Email=False
   Exit Function
  End If
 End If
  
 If Type_3=True Then
  Dim j
  Call Greate_UserDb()
  Call Create_Rs("Select * from User_Basic_Info where User_Email='"&Email_1&"'",1,1,"User")
    If Rs.Bof=False Then
     Chk_email=False
     Call Close_Rs()
     Call Close_UserDb()
     Exit Function
    End If
  Call Close_Rs()
 Call Close_UserDb()
 End If
 chk_email=True
End Function

Dim User_Db,User_Driver
Dim User_Conn

User_Db="Data/userdata.mdb"

'建立User_conn的过程
Sub Greate_UserDb()
 User_Driver="driver={Microsoft Access Driver (*.mdb)}"
 User_Driver=User_Driver&";dbq="&server.mappath(User_Db)
 'Response.Write (User_Driver)
Set User_Conn = Server.CreateObject("ADODB.Connection")
 User_Conn.Open(User_Driver)
End Sub

'关闭User_conn的过程
Sub Close_UserDb()
 User_Conn.Close
 Set User_Conn=Nothing
End Sub

Dim Reader
Dim Rs

'读取常数，并将每个常数保存在reader数组中，参数：R_Str(常数串)，F_Str(分隔符)，返回值：Reader数组的下标
Function R_Reader(R_Str,F_Str)
 Dim i
 
 If R_Str="" Or F_Str="" Then
  Exit Function
 End If
 
 Reader=Split(R_Str,F_Str)
 
 For i=0 To Ubound(Reader,1)
  Reader(i)=Cstr(Trim(Reader(i)))
 Next
 R_Reader=Ubound(Reader,1)
End Function

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