Replacing parts of a string

[rssmps]

I want to replace all -99999 in a line with just spaces.
I've got it working with the following code....but is there a more elegant way of doing it?

    
string entireLine = name+strID+strCP+strX1+strX2+strX3+strCD+strPS+strSEID;
string::size_type idx = 0;
while (true)
{
    idx = entireLine.find("-99999", idx);
    if (idx == string::npos)
         break;
    entireLine.replace(idx, 6,"      ");
    idx += 6;     
}

[Danny]

I think this code gets the job done faily efficiently and in in a non-terribly versbose manner. You could use a few advanced features such as predicated and transform() but I don't think they're really worth the effort in this case. One thing I might do differently: I would first scan the string for all positions of 999999, store the positions in a vector or something and then apply replace in a sequenc, using the previously stored indexes but that's up to you.