def assertMatchesBody(self, pattern, msg=None, flags=0):
        """Fail if value (a regex pattern) is not in self.body."""
        if re.search(pattern, self.body, flags) is None:
            if msg is None:
                msg = `pattern` % 'No match for %s in body'
            self._handlewebError(msg)
dataset/ETHPy150Open wesabe/fixofx/3rdparty/wsgi_intercept/webtest_intercept/webtest.py/WebCase.assertMatchesBody/swapped operands of `%`