[Exim] Need a little filter syntax help - lower case

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Συντάκτης: Marc Perkel
Ημερομηνία:  
Προς: exim-users
Αντικείμενο: [Exim] Need a little filter syntax help - lower case
Here's part of a filter expression I'm working on - it just shows the
string I'm working with to do a substitution:

${sg{$h_subject:${substr_0_100:$message_body}}\

but - what I really want is the low case of the string

$h_subject:${substr_0_100:$message_body}

What is the syntax for doing that?