[exim] regexp comparison in Exim

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Lähettäjä: Marten Lehmann
Päiväys:  
Vastaanottaja: exim-users
Aihe: [exim] regexp comparison in Exim
Hello,

I want to change the subject of an email in a transport, but only if a
certain condition is met. With this condition I want to check wether the
subject contains a contain string. Unfortunately, the only regular
expression possiblities seem to be modifiers, not comparison operators.
But as I don't know the exact position of the string on the subject, I
would need to do something like this line of perl code:

if ($subject =~ /thisandthat/) {
    subject = "add something: $subject";
}


How could I do this?

Regards
Marten