Add wide character test case and corpus

test/de_fuzz/wide.cpp

@@ -0,0 +1,21 @@
+
+#include <boost/regex.hpp>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) 
+{
+  if(Size < 2)
+    return 0;
+  std::vector<wchar_t> v(Data, Data + Size);
+  try{
+    size_t len = (Data[1] << 8) | Data[0];
+    if(len > Size - 2) len = Size - 2;
+    std::wstring str(&v[0] + 2, len);
+    std::wstring text(&v[0] + len, Size - len);
+    boost::wregex e(str);
+    boost::wsmatch what;
+    regex_search(text, what, e, boost::match_default|boost::match_partial);
+  }
+  catch(const std::exception&){}
+  return 0;
+}
+