diff --git a/.travis.yml b/.travis.yml
index 87a39402..df49941a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -28,10 +28,10 @@ matrix:
 
   include:
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++ CXXSTD=c++03
+      env: TOOLSET=gcc COMPILER=g++ CXXSTD=03
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-4.7 CXXSTD=c++03
+      env: TOOLSET=gcc COMPILER=g++-4.7 CXXSTD=03,11
       addons:
         apt:
           packages:
@@ -40,16 +40,7 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-4.7 CXXSTD=c++11
-      addons:
-        apt:
-          packages:
-            - g++-4.7
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-4.8 CXXSTD=c++03
+      env: TOOLSET=gcc COMPILER=g++-4.8 CXXSTD=03,11
       addons:
         apt:
           packages:
@@ -58,16 +49,7 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-4.8 CXXSTD=c++11
-      addons:
-        apt:
-          packages:
-            - g++-4.8
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-4.9 CXXSTD=c++03
+      env: TOOLSET=gcc COMPILER=g++-4.9 CXXSTD=03,11
       addons:
         apt:
           packages:
@@ -76,16 +58,7 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-4.9 CXXSTD=c++11
-      addons:
-        apt:
-          packages:
-            - g++-4.9
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-5 CXXSTD=c++03
+      env: TOOLSET=gcc COMPILER=g++-5 CXXSTD=03,11,14
       addons:
         apt:
           packages:
@@ -94,25 +67,7 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-5 CXXSTD=c++11
-      addons:
-        apt:
-          packages:
-            - g++-5
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-5 CXXSTD=c++14
-      addons:
-        apt:
-          packages:
-            - g++-5
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=c++03
+      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=03,11
       addons:
         apt:
           packages:
@@ -121,7 +76,7 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=c++11
+      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=14,1z
       addons:
         apt:
           packages:
@@ -130,7 +85,7 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=c++14
+      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=03,11 CXXSTD_DIALECT=cxxstd-dialect=gnu
       addons:
         apt:
           packages:
@@ -139,7 +94,7 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=c++1z
+      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=14,1z CXXSTD_DIALECT=cxxstd-dialect=gnu
       addons:
         apt:
           packages:
@@ -148,49 +103,10 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=gnu++03
-      addons:
-        apt:
-          packages:
-            - g++-6
-          sources:
-            - ubuntu-toolchain-r-test
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=gnu++11
-      addons:
-        apt:
-          packages:
-            - g++-6
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=gnu++14
-      addons:
-        apt:
-          packages:
-            - g++-6
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=gnu++1z
-      addons:
-        apt:
-          packages:
-            - g++-6
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++03
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.5 CXXSTD=c++03
+      env: TOOLSET=clang COMPILER=clang++-3.5 CXXSTD=03,11
       addons:
         apt:
           packages:
@@ -200,17 +116,7 @@ matrix:
             - llvm-toolchain-precise-3.5
 
     - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.5 CXXSTD=c++11
-      addons:
-        apt:
-          packages:
-            - clang-3.5
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.5
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.6 CXXSTD=c++03
+      env: TOOLSET=clang COMPILER=clang++-3.6 CXXSTD=03,11
       addons:
         apt:
           packages:
@@ -220,17 +126,7 @@ matrix:
             - llvm-toolchain-precise-3.6
 
     - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.6 CXXSTD=c++11
-      addons:
-        apt:
-          packages:
-            - clang-3.6
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.6
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.7 CXXSTD=c++03
+      env: TOOLSET=clang COMPILER=clang++-3.7 CXXSTD=03,11
       addons:
         apt:
           packages:
@@ -240,17 +136,7 @@ matrix:
             - llvm-toolchain-precise-3.7
 
     - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.7 CXXSTD=c++11
-      addons:
-        apt:
-          packages:
-            - clang-3.7
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.7
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.8 CXXSTD=c++03
+      env: TOOLSET=clang COMPILER=clang++-3.8 CXXSTD=03,11
       addons:
         apt:
           packages:
@@ -260,17 +146,7 @@ matrix:
             - llvm-toolchain-precise-3.8
 
     - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.8 CXXSTD=c++11
-      addons:
-        apt:
-          packages:
-            - clang-3.8
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.8
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.8 CXXSTD=c++14
+      env: TOOLSET=clang COMPILER=clang++-3.8 CXXSTD=14,1z
       addons:
         apt:
           packages:
@@ -281,18 +157,7 @@ matrix:
             - llvm-toolchain-precise-3.8
 
     - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.8 CXXSTD=c++1z
-      addons:
-        apt:
-          packages:
-            - clang-3.8
-            - libstdc++-4.9-dev
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.8
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.9 CXXSTD=c++03
+      env: TOOLSET=clang COMPILER=clang++-3.9 CXXSTD=03,11
       addons:
         apt:
           packages:
@@ -303,29 +168,7 @@ matrix:
             - llvm-toolchain-precise-3.9
 
     - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.9 CXXSTD=c++11
-      addons:
-        apt:
-          packages:
-            - clang-3.9
-            - libstdc++-4.9-dev
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.9
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.9 CXXSTD=c++14
-      addons:
-        apt:
-          packages:
-            - clang-3.9
-            - libstdc++-4.9-dev
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.9
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.9 CXXSTD=c++1z
+      env: TOOLSET=clang COMPILER=clang++-3.9 CXXSTD=14,1z
       addons:
         apt:
           packages:
@@ -336,39 +179,31 @@ matrix:
             - llvm-toolchain-precise-3.9
 
     - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++03
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11
       osx_image: xcode8.3
 
     - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=14,1z
       osx_image: xcode8.3
 
     - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++14
-      osx_image: xcode8.3
-
-    - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++1z
-      osx_image: xcode8.3
-
-    - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11
       osx_image: xcode8.2
 
     - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11
       osx_image: xcode8.1
 
     - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11
       osx_image: xcode8.0
 
     - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11
       osx_image: xcode7.3
 
     - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11
       osx_image: xcode6.4
 
 install:
@@ -426,9 +261,11 @@ install:
 
 script:
   - |-
-    echo "using $TOOLSET : : $COMPILER : <cxxflags>-std=$CXXSTD ;" > ~/user-config.jam
-  - (cd libs/config/test && ../../../b2 config_info_travis_install toolset=$TOOLSET && ./config_info_travis)
-  - ./b2 -j3 libs/regex/test toolset=$TOOLSET
+    echo "using $TOOLSET : : $COMPILER ;" > ~/user-config.jam
+  - IFS=','
+  - for CXXLOCAL in $CXXSTD; do  (cd libs/config/test && ../../../b2 config_info_travis_install toolset=$TOOLSET cxxstd=$CXXLOCAL $CXXSTD_DIALECT && echo With Standard Version $CXXLOCAL && ./config_info_travis && rm ./config_info_travis)  done
+  - unset IFS
+  - ./b2 -j3 libs/regex/test toolset=$TOOLSET cxxstd=$CXXSTD $CXXSTD_DIALECT
 
 notifications:
   email:
diff --git a/include/boost/regex/v4/perl_matcher.hpp b/include/boost/regex/v4/perl_matcher.hpp
index 198acc27..a696e5d9 100644
--- a/include/boost/regex/v4/perl_matcher.hpp
+++ b/include/boost/regex/v4/perl_matcher.hpp
@@ -379,6 +379,9 @@ public:
       :  m_result(what), base(first), last(end), 
          position(first), backstop(l_base), re(e), traits_inst(e.get_traits()), 
          m_independent(false), next_count(&rep_obj), rep_obj(&next_count)
+#ifdef BOOST_REGEX_NON_RECURSIVE
+      , m_recursions(0)
+#endif
    {
       construct_init(e, f);
    }
@@ -566,6 +569,8 @@ private:
    bool m_unwound_alt;
    // We are unwinding a commit - used by independent subs to determine whether to stop there or carry on unwinding:
    //bool m_unwind_commit;
+   // Recursion limit:
+   unsigned m_recursions;
 #endif
 
    // these operations aren't allowed, so are declared private,
diff --git a/include/boost/regex/v4/perl_matcher_non_recursive.hpp b/include/boost/regex/v4/perl_matcher_non_recursive.hpp
index 789226ba..3d89749d 100644
--- a/include/boost/regex/v4/perl_matcher_non_recursive.hpp
+++ b/include/boost/regex/v4/perl_matcher_non_recursive.hpp
@@ -143,6 +143,15 @@ struct saved_change_case : public saved_state
    saved_change_case(bool c) : saved_state(18), icase(c) {}
 };
 
+struct incrementer
+{
+   incrementer(unsigned* pu) : m_pu(pu) { ++*m_pu; }
+   ~incrementer() { --*m_pu; }
+   bool operator > (unsigned i) { return *m_pu > i; }
+private:
+   unsigned* m_pu;
+};
+
 template <class BidiIterator, class Allocator, class traits>
 bool perl_matcher<BidiIterator, Allocator, traits>::match_all_states()
 {
@@ -187,7 +196,9 @@ bool perl_matcher<BidiIterator, Allocator, traits>::match_all_states()
       &perl_matcher<BidiIterator, Allocator, traits>::match_commit,
       &perl_matcher<BidiIterator, Allocator, traits>::match_then,
    };
-
+   incrementer inc(&m_recursions);
+   if(inc > 80)
+      raise_error(traits_inst, regex_constants::error_complexity);
    push_recursion_stopper();
    do{
       while(pstate)
@@ -1762,8 +1773,11 @@ bool perl_matcher<BidiIterator, Allocator, traits>::unwind_non_greedy_repeat(boo
 template <class BidiIterator, class Allocator, class traits>
 bool perl_matcher<BidiIterator, Allocator, traits>::unwind_recursion(bool r)
 {
+   // We are backtracking back inside a recursion, need to push the info
+   // back onto the recursion stack, and do so unconditionally, otherwise
+   // we can get mismatched pushes and pops...
    saved_recursion<results_type>* pmp = static_cast<saved_recursion<results_type>*>(m_backup_state);
-   if(!r)
+   if (!r)
    {
       recursion_stack.push_back(recursion_info<results_type>());
       recursion_stack.back().idx = pmp->recursion_id;
@@ -1780,8 +1794,10 @@ bool perl_matcher<BidiIterator, Allocator, traits>::unwind_recursion(bool r)
 template <class BidiIterator, class Allocator, class traits>
 bool perl_matcher<BidiIterator, Allocator, traits>::unwind_recursion_pop(bool r)
 {
+   // Backtracking out of a recursion, we must pop state off the recursion
+   // stack unconditionally to ensure matched pushes and pops:
    saved_state* pmp = static_cast<saved_state*>(m_backup_state);
-   if(!r)
+   if (!r)
    {
       *m_presult = recursion_stack.back().results;
       position = recursion_stack.back().location_of_start;
diff --git a/test/regress/test_locale.cpp b/test/regress/test_locale.cpp
index 13aa85b9..692d83e6 100644
--- a/test/regress/test_locale.cpp
+++ b/test/regress/test_locale.cpp
@@ -191,8 +191,11 @@ void test_en_locale(const char* name, boost::uint32_t lcid)
    // causes these tests to crash (pointer overrun in std::collate<wchar_t>::do_transform).
    TEST_REGEX_SEARCH_L("[a-z]+", perl|::boost::regex_constants::collate, "\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf8\xf9\xfa\xfb\xfc", match_default, make_array(0, 28, -2, -2));
    TEST_REGEX_SEARCH_L("[a-z]+", perl|::boost::regex_constants::collate, "\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd8\xd9\xda\xdb\xdc", match_default, make_array(1, 28, -2, -2));
-   // and equivalence classes:
-   TEST_REGEX_SEARCH_L("[[=a=]]+", perl, "aA\xe0\xe1\xe2\xe3\xe4\xe5\xc0\xc1\xc2\xc3\xc4\xc5", match_default, make_array(0, 14, -2, -2));
+   if (lcid != 0x09)
+   {
+      // and equivalence classes, these fail for locale "en" but pass for "en_UK" and "en_US":
+      TEST_REGEX_SEARCH_L("[[=a=]]+", perl, "aA\xe0\xe1\xe2\xe3\xe4\xe5\xc0\xc1\xc2\xc3\xc4\xc5", match_default, make_array(0, 14, -2, -2));
+   }
    // case mapping:
    TEST_REGEX_SEARCH_L("[A-Z]+", perl|icase|::boost::regex_constants::collate, "\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf8\xf9\xfa\xfb\xfc", match_default, make_array(0, 28, -2, -2));
    TEST_REGEX_SEARCH_L("[a-z]+", perl|icase|::boost::regex_constants::collate, "\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd8\xd9\xda\xdb\xdc", match_default, make_array(1, 28, -2, -2));