Index: test/re/re.regex/re.regex.construct/bad_escape.pass.cpp
===================================================================
--- test/re/re.regex/re.regex.construct/bad_escape.pass.cpp	(revision 186291)
+++ test/re/re.regex/re.regex.construct/bad_escape.pass.cpp	(working copy)
@@ -17,21 +17,29 @@
 #include <regex>
 #include <cassert>
 
-int main() 
+static bool error_escape_thrown(const char *pat) 
 {
-    // Correct: Exception thrown for invalid escape char in a character class
+    bool result = false;
     try {
-        std::regex char_class_escape("[\\a]");
-        assert(false);
+        std::regex re(pat);
     } catch (std::regex_error &ex) {
-        assert(ex.code() == std::regex_constants::error_escape);
+        result = (ex.code() == std::regex_constants::error_escape);
     }
+    return result;
+}
 
-    // Failure: No exception thrown for invalid escape char in this case.
-    try {
-        std::regex escape("\\a");
-        assert(false);
-    } catch (std::regex_error &ex) {
-        assert(ex.code() == std::regex_constants::error_escape);
-    }
+int main() 
+{
+    assert(error_escape_thrown("[\\a]"));
+    assert(error_escape_thrown("\\a"));
+
+    assert(error_escape_thrown("[\\e]"));
+    assert(error_escape_thrown("\\e"));
+
+    assert(error_escape_thrown("[\\c:]"));
+    assert(error_escape_thrown("\\c:"));
+    assert(error_escape_thrown("\\c"));
+    assert(!error_escape_thrown("[\\cA]"));
+    assert(!error_escape_thrown("\\cA"));
+
 }
Index: include/regex
===================================================================
--- include/regex	(revision 186291)
+++ include/regex	(working copy)
@@ -4418,7 +4418,8 @@
         case 'c':
             if ((__t = _VSTD::next(__first)) != __last)
             {
-                if ('A' <= *__t <= 'Z' || 'a' <= *__t <= 'z')
+                if (('A' <= *__t && *__t <= 'Z') || 
+                    ('a' <= *__t && *__t <= 'z'))
                 {
                     if (__str)
                         *__str = _CharT(*__t % 32);
@@ -4426,7 +4427,15 @@
                         __push_char(_CharT(*__t % 32));
                     __first = ++__t;
                 }
+#ifndef _LIBCPP_NO_EXCEPTIONS
+                else 
+                    throw regex_error(regex_constants::error_escape);
+#endif  // _LIBCPP_NO_EXCEPTIONS
             }
+#ifndef _LIBCPP_NO_EXCEPTIONS
+            else
+                throw regex_error(regex_constants::error_escape);
+#endif  // _LIBCPP_NO_EXCEPTIONS
             break;
         case 'u':
             ++__first;