perl: Testing MGRS coordinates

Hi

I need to convert MGRS coordinates into digital Latitude Longitude

The metacpan module Geo::Coordinates::UTM  achieves this  by

($latitude,$longitude)=mgrs_to_latlon(23,'30VWK1254306804')

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However if the MGRS coordinates  are incorrect it fails by crashing the script

How do I test the  MGRS coordinates prior to conversion? without killing the script but report error to user

Tried this but still crashes

if( ($latitude,$longitude)=mgrs_to_latlon(23,$mgrs) ){
  ## Do something with $mgrs
}
else{
 print "$mgrs incorrect in $InputDoc\n"
}

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BTW I need to test all the  MGRS coordinates within the In put Doc so I can report it to the user