-c:'field_1=value_1','field_2>value_2'

##</code><code>##

-c 'field_1=value_1' -c 'field_2>value_2'

##</code><code>##

use Getopt::Long;
our @opt_c;
GetOptions("c=s@");
print join ", ", @opt_c;

##</code><code>##

/^(.*?)([<=>])(.*)/