Add listdir to fileop

str_util.h

@@ -9,5 +9,13 @@ namespace str_util {
      * @return true if successed.
     */
     bool tolowercase(std::string ori, std::string& result);
+    /**
+     * @brief Replace all pattern to new_content
+     * @param input Input string
+     * @param pattern Pattern
+     * @param new_content New content
+     * @return Result string
+    */
+    std::string str_replace(std::string input, std::string pattern, std::string new_content);
 }
 #endif