text: import re
  from urlparse import urljoin
  
  from w3lib.html import remove_tags, remove_entities, replace_escape_chars
  
  from scrapy.link import Link
  from .sgml import SgmlLinkExtractor
  
  linkre = re.compile(
      "<a\s.*?href=(\"[.#]+?\"|\'[.#]+?\'|[^\s]+?)(>|\s.*?>)(.*?)<[/ ]?a>",
      re.DOTALL | re.IGNORECASE)
  
  
  def clean_link(link_text):
      """Remove leading and trailing whitespace and punctuation"""
      return link_text.strip("\t\r\n '\"")
  
  
  class RegexLinkExtractor(SgmlLinkExtractor):
  
      """High performant link extractor"""
  
      def _extract_links(self, response_text, response_url, response_encoding, base_url=None):
          if base_url is None:
              base_url = urljoin(
                  response_url, self.base_url) if self.base_url else response_url
  
          clean_url = lambda u: urljoin(
              base_url, remove_entities(clean_link(u.decode(response_encoding))))
          clean_text = lambda t: replace_escape_chars(
              remove_tags(t.decode(response_encoding))).strip()
  
          links_text = linkre.findall(response_text)
          return [Link(clean_url(url).encode(response_encoding),
                       clean_text(text))
                  for url, _, text in links_text]
  