+ def _search_regex(self, pattern, string, name, default=None, fatal=True, flags=0):
+ """
+ Perform a regex search on the given string, using a single or a list of
+ patterns returning the first matching group.
+ In case of failure return a default value or raise a WARNING or a
+ ExtractorError, depending on fatal, specifying the field name.
+ """
+ if isinstance(pattern, (str, compat_str, compiled_regex_type)):
+ mobj = re.search(pattern, string, flags)
+ else:
+ for p in pattern:
+ mobj = re.search(p, string, flags)
+ if mobj: break
+
+ if sys.stderr.isatty() and os.name != 'nt':
+ _name = u'\033[0;34m%s\033[0m' % name
+ else:
+ _name = name
+
+ if mobj:
+ # return the first matching group
+ return next(g for g in mobj.groups() if g is not None)
+ elif default is not None:
+ return default
+ elif fatal:
+ raise ExtractorError(u'Unable to extract %s' % _name)
+ else:
+ self._downloader.report_warning(u'unable to extract %s; '
+ u'please report this issue on GitHub.' % _name)
+ return None
+
+ def _html_search_regex(self, pattern, string, name, default=None, fatal=True, flags=0):
+ """
+ Like _search_regex, but strips HTML tags and unescapes entities.
+ """
+ res = self._search_regex(pattern, string, name, default, fatal, flags)
+ if res:
+ return clean_html(res).strip()
+ else:
+ return res
+