Test if an Email Header Matches a Pattern

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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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//  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.

Chilkat.Email email = new Chilkat.Email();
email.Subject = "Monthly invoice #4432";
email.From = "billing@example.com";

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

if (match == true) {
    Debug.WriteLine("The Subject header contains 'invoice'.");
}
else {
    Debug.WriteLine("The Subject header does not contain 'invoice'.");
}