':return: None, the result is saved in self._path_disc_regex_list'

def setup(self):

    if (self._signature_re is not None):
        return
    all_signatures = []
    for path_disclosure_string in get_common_directories():
        regex_string = '(%s.*?)[^A-Za-z0-9\\._\\-\\/\\+~]'
        regex_string = (regex_string % path_disclosure_string)
        all_signatures.append(regex_string)
    self._signature_re = multi_re(all_signatures, hint_len=1)
