--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/3rdparty/maddy/strongparser.h	Tue Aug 17 11:19:54 2021 +0200
@@ -0,0 +1,59 @@
+/*
+ * This project is licensed under the MIT license. For more information see the
+ * LICENSE file.
+ */
+#pragma once
+
+// -----------------------------------------------------------------------------
+
+#include <string>
+#include <regex>
+
+#include "maddy/lineparser.h"
+
+// -----------------------------------------------------------------------------
+
+namespace maddy {
+
+// -----------------------------------------------------------------------------
+
+/**
+ * StrongParser
+ *
+ * Has to be used before the `EmphasizedParser`.
+ *
+ * @class
+ */
+class StrongParser : public LineParser
+{
+public:
+  /**
+   * Parse
+   *
+   * From Markdown: `text **text** __text__`
+   *
+   * To HTML: `text <strong>text</strong> <strong>text</strong>`
+   *
+   * @method
+   * @param {std::string&} line The line to interpret
+   * @return {void}
+   */
+  void
+  Parse(std::string& line) override
+  {
+    static std::vector<std::regex> res
+    {
+      std::regex{"(?!.*`.*|.*<code>.*)\\*\\*(?!.*`.*|.*<\\/code>.*)([^\\*\\*]*)\\*\\*(?!.*`.*|.*<\\/code>.*)"},
+      std::regex{"(?!.*`.*|.*<code>.*)__(?!.*`.*|.*<\\/code>.*)([^__]*)__(?!.*`.*|.*<\\/code>.*)"}
+    };
+    static std::string replacement = "<strong>$1</strong>";
+    for (const auto& re : res)
+    {
+      line = std::regex_replace(line, re, replacement);
+    }
+  }
+}; // class StrongParser
+
+// -----------------------------------------------------------------------------
+
+} // namespace maddy