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const char* def = "DEFINE";
while(*def && (m_position != m_end) && (*m_position == charT(*def)))
  ++m_position, ++def;
if((m_position == m_end) || *def)
{
  // Rewind to start of (? sequence:
  --m_position;
  while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position;
  fail(regex_constants::error_perl_extension, m_position - m_base);
  return false;
}
re_brace* br = static_cast<re_brace*>(this->append_state(syntax_element_assert_backref, sizeof(re_brace)));
br->index = 9999; // special magic value!
if(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_mark)
{
  // Rewind to start of (? sequence:
  --m_position;
  while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position;
  fail(regex_constants::error_perl_extension, m_position - m_base);
  return false;
}