Move test into test/std subdirectory.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/re/re.regex/re.regex.assign/assign_string_flag.pass.cpp

@@ -0,0 +1,31 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <regex>
+
+// template <class charT, class traits = regex_traits<charT>> class basic_regex;
+
+// template <class string_traits, class A>
+//   basic_regex& assign(const basic_string<charT, string_traits, A>& s,
+//                       flag_type f = regex_constants::ECMAScript);
+
+#include <regex>
+#include <cassert>
+
+int main()
+{
+    std::regex r2;
+    r2.assign(std::string("(a([bc]))"));
+    assert(r2.flags() == std::regex::ECMAScript);
+    assert(r2.mark_count() == 2);
+
+    r2.assign(std::string("(a([bc]))"), std::regex::extended);
+    assert(r2.flags() == std::regex::extended);
+    assert(r2.mark_count() == 2);
+}