diff --git a/test/Jamfile b/test/Jamfile
index fd10197b..de2945ed 100644
--- a/test/Jamfile
+++ b/test/Jamfile
@@ -75,7 +75,11 @@ test-suite regex
             pathology/recursion_test.cpp
             <lib>../../test/build/boost_test_exec_monitor
       ]
+      
+      [ compile pathology/concept_check.cpp
+      ]
 ;
 
 
 
+
diff --git a/test/pathology/concept_check.cpp b/test/pathology/concept_check.cpp
new file mode 100644
index 00000000..65edb04f
--- /dev/null
+++ b/test/pathology/concept_check.cpp
@@ -0,0 +1,38 @@
+
+#include <boost/regex.hpp>
+#include <boost/concept_archetype.hpp>
+#include <boost/concept_check.hpp>
+
+
+int main()
+{
+   typedef boost::bidirectional_iterator_archetype<char> iterator_type;
+   boost::regex r;
+   iterator_type a, b;
+   boost::detail::dummy_constructor dummy;
+   boost::output_iterator_archetype<char> out(dummy);
+   std::string s;
+   boost::match_results<iterator_type> what;
+
+   boost::regex_match(a, b, r);
+   boost::regex_match(a, b, what, r);
+   boost::regex_search(a, b, r);
+   boost::regex_search(a, b, what, r);
+   out = boost::regex_replace(out, a, b, r, s, boost::match_default);
+   s = boost::regex_replace(s, r, s, boost::match_default);
+
+   out = what.format(out, s, boost::format_default);
+   s = what.format(s, boost::format_default);
+
+   boost::function_requires<
+      boost::ForwardIteratorConcept<
+         boost::regex_iterator<iterator_type>
+      >
+   >();
+   boost::function_requires<
+      boost::ForwardIteratorConcept<
+         boost::regex_token_iterator<iterator_type>
+      >
+   >();
+
+}
diff --git a/test/regress/regress.h b/test/regress/regress.h
index 94be2e89..a52b90ae 100644
--- a/test/regress/regress.h
+++ b/test/regress/regress.h
@@ -157,8 +157,7 @@ public:
 
    void deallocate(pointer p, size_type n)
    {
-      assert( (p == 0) == (n == 0) );
-      if (p != 0)
+      if ((p != 0) && (n != 0))
          base_type::deallocate((void*)p, n * sizeof(value_type));
    }