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# generate numeric comparison routines
sub build_num_comp {
...
  elsif($cexp eq 'nr') { return sub { return ($_[0] !~ /$cval/); } }
  else { print "Invalid comparison, use ax -h for help.\n"; exit(1); }
}

sub build_num_comp {
   my $truth = eval "@_";
...

print build_num_comp(5,'==',5)->() ? 'yes' : 'no';
print build_num_comp(5,'!=',5)->() ? 'yes' : 'no';