Get overlays for the text.
        :param text: The text to be searched. This is an overlay
        object.
        :param offset: Match starting that index. If none just search.
        :returns: A generator for overlays.

def offset_overlays(self, text, offset=0, **kw):
        """
        Get overlays for the text.
        :param text: The text to be searched. This is an overlay
        object.
        :param offset: Match starting that index. If none just search.
        :returns: A generator for overlays.
        """

        for ovl in text.overlays:
            if ovl.match(offset=offset, props=self.props_match):
                yield ovl.copy(props=self.props,
                               value=self.value(overlay=ovl))