diff --git a/stl/inc/regex b/stl/inc/regex
index 5491b129ed0..e58c47066bd 100644
--- a/stl/inc/regex
+++ b/stl/inc/regex
@@ -334,10 +334,7 @@ public:
     template <class _Iter>
     char_class_type lookup_classname(_Iter _First, _Iter _Last, bool _Icase = false) const {
         // map [_First, _Last) to character class mask value
-#define _REGEX_CHAR_CLASS_NAME(n, c)                            \
-    {                                                           \
-        n, L##n, static_cast<unsigned int>(_STD size(n) - 1), c \
-    }
+#define _REGEX_CHAR_CLASS_NAME(n, c) {n, L##n, static_cast<unsigned int>(_STD size(n) - 1), c}
         static constexpr _Cl_names _Names[] = {
             // map class names to numeric constants
             _REGEX_CHAR_CLASS_NAME("alnum", _Ch_alnum),
@@ -3575,15 +3572,14 @@ bool _Matcher<_BidIt, _Elem, _RxTraits, _It>::_Match_pat(_Node_base* _Nx) { // c
         case _N_neg_assert:
         case _N_assert:
             { // check assert
-                _It _Ch              = _Tgt_state._Cur;
                 bool _Neg            = _Nx->_Kind == _N_neg_assert;
                 _Bt_state_t<_It> _St = _Tgt_state;
                 if (_Match_pat(static_cast<_Node_assert*>(_Nx)->_Child) == _Neg) {
                     // restore initial state and indicate failure
                     _Tgt_state = _St;
                     _Failed    = true;
-                } else {
-                    _Tgt_state._Cur = _Ch;
+                } else if (!_Neg) {
+                    _Tgt_state._Cur = _St._Cur;
                 }
 
                 break;