[exim] Filter with special characters (!?)

Hi, I'm trying to create a discard rule for the incoming spam email which contains an special characters in a subject.


In the exim log i see this:


2018-08-22 07:48:12 1fsQgL-000554-6N Entrantes y Salientes autenticados - Cuenta_FROM: <casagrognetiff@???> - X-Mailer = Microsoft Outlook Express 6.00.2900.2950 - Subject = \277Eres el del video?

discard    condition = ${if match{$header_subject:}{^\277Eres el del video?\$}}           logwrite = Rejected By SPAM - $header_subject - FROM: "$sender_address"

In incoming mail, the subject contains this character (!)

How should I indicate the rule?

Regards,