Here's one way of doing it using an environment variable. It's not elegant - but it works. Near the top of your subtest - consider:
subtest test_someTestFunction => sub {
my $testName = "test_someTestFunction";
plan skip_all => 'FILTER' if( $ENV{TESTFILTER} && ($testName !~ /$ENV{TESTFILTER}/);
# Remainder of your test code
};