Strengthen the client_secret sanitizer regex (#5474)

* Strengthen the client_secret sanitizer regex

* clang-format update

sdk/core/azure-core-test/src/test_proxy_manager.cpp

@@ -241,10 +241,7 @@ void TestProxyManager::SetProxySanitizer()
   };
 
   addSanitizer(SanitizerType::General, g_accountRegex, "account");
-  addSanitizer(
-      SanitizerType::Body,
-      "client_secret=(?<clientsecret>[a-zA-Z0-9\\%_~\\-\\.]+)",
-      "clientsecret");
+  addSanitizer(SanitizerType::Body, "client_secret=(?<clientsecret>[^&]+)", "clientsecret");
   const std::string storageSasSignatureRegex = "\\?.*sig=(?<sassig>[a-zA-Z0-9\\%\\/+=]+)";
   addSanitizer(SanitizerType::Uri, storageSasSignatureRegex, "sassig");
   addSanitizer(SanitizerType::Header, storageSasSignatureRegex, "sassig", "x-ms-copy-source");