[exim] Exim filter get number before the dot

Heloo
In exim filter, numeric values in the "is above" rule are only accepted as integers
I have to execute the delivery command if the header value is above some number,
unfortunately many of them are written in the header and are decimal numbers, as a result I get an error
error in filter file: malformed numerical string "16.34"
here is my expression
if
$h_X-Spam-Potential: is not "" and ${sg{$h_X-Spam-Potential:}{^(\d+)\..*}{$1}} is above 16
then
......
theoretically, only the number 16 before the dot should be taken into account but unfortunately this doesn't happen :( thanks for help Slawek

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