code: def search_meta_tag(html_doc, prefix, code):
      
      regex = '<meta\s+(?:name=([\'\"]){0}\\1\s+content=([\'\"]){1}\\2|content=([\'\"]){1}\\3\s+name=([\'\"]){0}\\4)\s*/?>'.format(prefix, code)
      meta = re.compile(regex, flags=re.MULTILINE | re.IGNORECASE)
      m = meta.search(html_doc)
      if m:
          head = re.search(r'</head>', html_doc, flags=re.IGNORECASE)
          if head and m.start() < head.start():
              return True
      return False
docs: Checks whether the html_doc contains a meta matching the prefix & code