Add first de-fuzzer files

test/de_fuzz/narrow.cpp

@@ -0,0 +1,19 @@
+
+#include <boost/regex.hpp>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) 
+{
+  if(Size < 2)
+    return 0;
+  try{
+    size_t len = (Data[1] << 8) | Data[0];
+    std::string str((char*)(Data + 2), len);
+    std::string text((char*)(Data + len), Size - len);
+    boost::regex e(str);
+    boost::smatch what;
+    regex_search(text, what, e, boost::match_default|boost::match_partial);
+  }
+  catch(const std::exception&){}
+  return 0;
+}
+