[exim] $message_body lsearch

I have a rule which searches the mail body for given sentences.
I would like to put these sentences from the configuration
into a file.

deny message = STOP!
condition = ${if or { \
    {match {${lc:$message_body}}{.*this is sentence one.*}} \
    {match {${lc:$message_body}}{.*this is sentence two.*}} \
    {match {${lc:$message_body}}{.*this is sentence three.*}} \
    }{1}{0}}

I tried something like

condition = ${if match{$message_body}{lsearch;/etc/local/exim/test-word}{yes}{no}}

with no success.

Wow can I do this?

Regards Hans.
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