First cut at new v5 regex version, doesn't really work yet, but all the infrastructure is in place...

[SVN r22489]

include/boost/regex/v4/regex_stack.hpp

@@ -177,7 +177,7 @@ void BOOST_REGEX_CALL jstack<T, Allocator>::pop_aux()const
 {
    // make sure that we have a valid item
    // on TOS:
-   jm_assert(m_stack->next);
+   BOOST_ASSERT(m_stack->next);
    register node* p = m_stack;
    m_stack = p->next;
    p->next = unused;