For general information about regular expressions support in C++11, refer to the Verifying the format of a string using regular expressions recipe. Basic knowledge of regular expressions is required for proceeding with this recipe.

In the following examples, text is a variable defined as shown here:

    auto text { 
      R"( 
        #remove # to uncomment the following lines 
        timeout=120 
        server = 127.0.0.1 

        #retrycount=3 
      )"s};