Looks for any possible text within given tag.

def _find_any_text(self, tag):
        """Looks for any possible text within given tag.
        """
        text = ''
        if tag is not None:
            text = six.text_type(tag)
            text = re.sub(r'(<[^>]+>)', '', text)
            text = re.sub(r'\s', ' ', text)
            text = text.strip()
        return text