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open REs, "< re_file" or die "can't read re_file: $!";
while (<REs>) {
...
  my $pat = shift;
  return eval qq{ sub { \$_[0] =~ $pat } };
}

for (@re) {
  my ($mode, $func) = @$_;
...
    else { print "this matched an exception\n"; }
  }
}