Re: [Boost-users] [Boost.StringAlgo] How to insert substr into str

Valentine Rozental wrote:

what is the elegant/right way to insert some substr into the given str? For example:

// ------------------------------------------------------- ... std::string str("xyz_123_abc_xyyz_a1b"); std::string mark("abc"); std::string substr("$$$");

iterator_rangestd::string::type> it1 = boost::find_first(str, mark); ... // -------------------------------------------------------

I want to insert substr ("$$$") after mark ("abc") if the mark exists in the str. That is, the result in the example above should be: "xyz_123_abc$$$_xyyz_a1b"

This is a non-boost answer, but I'd have written something like: std::string::size_type found = str.find(mark); if (found != std::string::npos) { str.insert(found + mark.length(), substr); }