Why use a regex? It'd be better to use a real parser, and I'm probbably going to fail on selecting the fields, but once you get that, just split the list on commas, and choose the first word from each:

local $/ = undef;
my $create_sql = <DATA>;

my ($tablename, $fields) = ($create_sql =~ m/create table ".+?"[.](\w+
+)\s+\((.*?)\);/s);
print "$tablename\n";

foreach my $fieldinfo (split /,/, $fields) {
  my ($fieldname) = ( $fieldinfo =~ m/^\s*(\w+)/ );
  print "$tablename.$fieldname\n";
}

__DATA__
create table "metrica".vodafone_capacity_cell_count_week
  (
    nc_id integer,
    cell_id varchar(50) not null ,
    week_of integer not null ,
    busy_hour "informix".utime,
    gsm_tch_cong_pc_range_1 integer,
    gsm_tch_cong_pc_range_2 integer,
    gsm_tch_cong_pc_range_3 integer,
    gsm_sdcch_cong_pc_range_1 integer,
    gsm_sdcch_cong_pc_range_2 integer,
    gsm_sdcch_cong_pc_range_3 integer,
    gsm_sdcch_cong_pc_range_4 integer,
    gsm_hr_tch_util_pc_range_1 integer,
    gsm_hr_tch_util_pc_range_2 integer,
    gsm_hr_tch_util_pc_range_3 integer,
    gsm_hr_tch_util_pc_range_4 integer,
    gsm_hr_tch_util_pc_range_5 integer,
    gprs_cong_pc_range_1 integer,
    gprs_cong_pc_range_2 integer,
    gprs_cong_pc_range_3 integer,
    config_tch integer,
    config_fpdch integer,
    config_trx integer,
    config_layer integer,
    cell_type varchar(25)
        default null
  );
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