String Delimitiers

I have strings that are something like

3.4meq/kg/day

which I want to parse. The numbers on the front are critical for later
calculations. But I want to pull the descriptors apart. I can use get()
to do this, but if just seems so sloppy.

This is a code snippet that extracts the numbers. Can't I change the
delimitor for the istringstream class? I'm overwhelmed with a lot of data
on the strings and iostream libraries, but not enough context.

    double day_weight;
    string day_weight_unit;
    istringstream stream1;
    stream1.clear();
    stream1.str(mgkgperday);

    string errorstg = "Can't find rate per day";
    try{
        //15meq/kg/day
        if(! stream1 >> ws >> day_weight )
        { throw errorstg;
        }
        if(! stream1 >> ws >> day_wright_unit){
            throw errorstg;
        }
    }catch (string errorstg){
        cout << errorstg << "mg/kg/day";
    }

    //total weight of lyte needed in 24 hours;
    const string ml = "ml";
    double twgt = mgkgperday * c_pt_wgt; //cast float to double
    double tvol_per_day = rate_ml_hr * 24;
    double needed_wgt, total_bags_vol;
    int number_of_bags;

Ruben

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