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my @names = qw(name age location); # add do this list whenever
# make a hash reference and populate it
@$fields{@names} = ( ... list of corresponding values ...);

# a normal hash assignment - scalar context
$field{'name'} = 'Richard';
# a normal hash assignment - list context
@field{qw(name age)} = qw(Richard 24);

use strict;
my @names = qw(name age location); # add do this list whenever
# make a hash reference and populate it
my $fields = {};  # declare $fields being a hash reference
@$fields{@names} = ( ... list of corresponding values ...);

$mech->submit_form(
    form_name => $search_form,
    fields      => $fields,
    }
);