def re(self, event_property, value):
        """A regular expression filter chain.

        >>> request_time = EventExpression('request', 'elapsed_ms')
        >>> filtered = request_time.re('path', '[^A-Za-z0-9+]')
        >>> print(filtered)
        request(elapsed_ms).re(path, "[^A-Za-z0-9+]")
        """
        c = self.copy()
        c.filters.append(filters.RE(event_property, value))
        return c
A regular expression filter chain.

        >>> request_time = EventExpression('request', 'elapsed_ms')
        >>> filtered = request_time.re('path', '[^A-Za-z0-9+]')
        >>> print(filtered)
        request(elapsed_ms).re(path, "[^A-Za-z0-9+]")