modernize C++: raw string literal

src/Gui/MDIView.cpp

@@ -149,13 +149,13 @@ void MDIView::onRelabel(Gui::Document *pDoc)
         // Try to separate document name and view number if there is one
         QString cap = windowTitle();
         // Either with dirty flag ...
-        QRegularExpression rx(QLatin1String("(\\s\\:\\s\\d+\\[\\*\\])$"));
+        QRegularExpression rx(QLatin1String(R"((\s\:\s\d+\[\*\])$)"));
         QRegularExpressionMatch match;
         //int pos =
         boost::ignore_unused(cap.lastIndexOf(rx, -1, &match));
         if (!match.hasMatch()) {
             // ... or not
-            rx.setPattern(QLatin1String("(\\s\\:\\s\\d+)$"));
+            rx.setPattern(QLatin1String(R"((\s\:\s\d+)$)"));
             //pos =
             boost::ignore_unused(cap.lastIndexOf(rx, -1, &match));
         }