code: def fetchText(cls, url, data, textSearch, optional):
          
          if cls.css:
              searchFun = data.cssselect
          else:
              searchFun = data.xpath
          if textSearch:
              text = ''
              for match in searchFun(textSearch):
                  try:
                      text += ' ' + match.text_content()
                  except AttributeError:
                      text += ' ' + unicode(match)
              if text.strip() == '':
                  if optional:
                      return None
                  else:
                      raise ValueError("XPath %s did not match anything at URL %s." % (textSearch, url))
              out.debug(u'Matched text %r with XPath %s' % (text, textSearch))
              return unescape(text).strip()
          else:
              return None
docs: Search text entry for given text XPath in a HTML page.