Classic ASP

Test if an Email Header Matches a Pattern

Demonstrates the Chilkat Email.HasHeaderMatching method, which returns true when the email contains a header field named by the first argument whose value matches the wildcard pattern in the second argument. The third argument selects case-sensitive matching. This example checks whether the Subject contains the word "invoice".

Background: The value pattern supports wildcards — * matches any run of characters — so *invoice* matches any subject containing "invoice" anywhere. This is a compact way to classify or filter messages by header content, for example routing billing mail or flagging automated notices, without manually fetching the header value and testing it yourself.

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
'  Demonstrates the HasHeaderMatching method, which returns true when the email contains a
'  header field named by the first argument whose value matches the wildcard pattern in the second argument.  The third argument selects
'  case-sensitive matching.

set email = Server.CreateObject("Chilkat.Email")
email.Subject = "Monthly invoice #4432"
email.From = "billing@example.com"

'  Check whether the Subject header value matches a wildcard pattern (case-insensitive).
match = email.HasHeaderMatching("Subject","*invoice*",0)

If (match = 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "The Subject header contains 'invoice'.") & "</pre>"
Else
    Response.Write "<pre>" & Server.HTMLEncode( "The Subject header does not contain 'invoice'.") & "</pre>"
End If


%>
</body>
</html>