Below is a VB Script example of how to validate an email address using Regular Expressions:
<script language="vbscript">
function ValidateEmail(sEmail)
set myExpression = new RegExp
myExpression.pattern = "^(\w+\.)*(\w+)@(\w+\.)+([a-zA-Z]{2,4})$"
If myExpression.test(sEmail.value) = True Then
msgbox "Valid Email"
Else
msgbox "Invalid Email"
End If
End Function
</script>
<form name="email">
<input type=text name="txtEmail" maxlength=44 width=40>
<input type=button onclick="ValidateEmail(txtEmail)">
</form>
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