Fixed some bugs in the ecma bracket epression regarding escaped characters, and got the awk grammar going.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@109599 91177308-0d34-0410-b5e6-96231b3b80d8

test/re/re.alg/re.alg.search/ecma.pass.cpp

@@ -788,6 +788,21 @@ int main()
         assert(m.position(0) == 6);
         assert(m.str(0) == "Jeff");
     }
+    {
+        std::cmatch m;
+        const char s[] = "5%k";
+        assert(std::regex_search(s, m, std::regex("\\d[\\W]k")));
+        assert(m.size() == 1);
+        assert(!m.prefix().matched);
+        assert(m.prefix().first == s);
+        assert(m.prefix().second == m[0].first);
+        assert(!m.suffix().matched);
+        assert(m.suffix().first == m[0].second);
+        assert(m.suffix().second == s + std::char_traits<char>::length(s));
+        assert(m.length(0) == std::char_traits<char>::length(s));
+        assert(m.position(0) == 0);
+        assert(m.str(0) == s);
+    }
 
     {
         std::wcmatch m;
@@ -1552,4 +1567,19 @@ int main()
         assert(m.position(0) == 6);
         assert(m.str(0) == L"Jeff");
     }
+    {
+        std::wcmatch m;
+        const wchar_t s[] = L"5%k";
+        assert(std::regex_search(s, m, std::wregex(L"\\d[\\W]k")));
+        assert(m.size() == 1);
+        assert(!m.prefix().matched);
+        assert(m.prefix().first == s);
+        assert(m.prefix().second == m[0].first);
+        assert(!m.suffix().matched);
+        assert(m.suffix().first == m[0].second);
+        assert(m.suffix().second == s + std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert(m.position(0) == 0);
+        assert(m.str(0) == s);
+    }
 }