Concatenate all non numeric strings in String array

I have a String array like this

    String str="9790020760001613 JOHN MATHEWS          -66822.60        65000.00        69000.00        -1822.60  KARL MAX";
    String[] token = str.split("\\s+");

I wanted to concatenate all the non numeric tokens(e.g JOHN MATHEWS ) till a non numeric token is immediately followed by numeric string so that above token String array would look like this:

[9790020760001613 ,JOHN MATHEWS,-66822.60,65000.00,69000.00,-1822.60,KARL MAX]