[Exim] ignoring case in "matches" (message filter)

Hello!

    How do i ignore case in this expression?

if $header_X-Mailer matches "Mail Bomber|Aureate Group Mail Free
Edition|MultiMailer|MailWorkZ +Broadcast" # sent by spamware
    or $message_body matches "Extractor +Pro|List +Address
+Manager|Multimailer|MailWorkZ +Broadcast" # advertise spamware
    or $message_body matches "S\. ?1618 +T[íi]tulo +(3(ro)?|III)" #
murkowsky bill
    or $message_body matches "Por secci[óo]n 301, p[áa]rrafo (a)(2)(C) de
S\. ?1618" then # more murk
    deliver "Maximiliano Kolus <mkolus@???>"
endif

    I would need exim to ignore case on these regular expressions.

-----------------------
Maximiliano Kolus
System Engineer - Amtec.net

mkolus@???
<http://www.amtec.net>

Amtec.net - The eBuilder Company of LatinAmerica

PS: Yes, i know that Aureate isnt spamware, but the free edition, in
Argentina, was *only* used for spamming, no legitimate mail was intercepted
by this filter.