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

From: Nat Goodspeed (nat_at_[hidden])
Date: 2008-06-04 13:31:55

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("$$$");
> 
> iterator_range<range_iterator<std::string>::type>
>         it1 = boost::find_first(str, mark);
> ...
> // -------------------------------------------------------
> 
> I want to insert substr ("$$$") 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);
}