Sort with Number and String - does not sort to a number

Question

I have an array of objects like the below:

[ {"code":1,"name": "01 - teste um"},
  {"code":8,"name": "02 - teste dois"},
  {"code":32,"name": "209 - teste teste"} ...]

I need to sort this array by key name. Note that this key can be string only, "test" example, but it can also have a numeral on the front ("06 - test") with a hyphen/dash or a dot (07 . teste três).

The function I am using for sorting follows below.

var arrayOrdenado = array.sort(function( a, b ) { 
    var a_nome = a.name;
    var b_nome = b.name;
    if (a_nome && a_nome.indexOf(".")>-1){
        var a_nome = a_nome.substr(0, a_nome.indexOf("."));
        a_nome = parseFloat(a_nome);
    } else if (a_nome && a_nome.indexOf("-")>-1){
        var a_nome = a_nome.substr(0, a_nome.indexOf("-"));
        a_nome = parseFloat(a_nome);
    } 

    if (b_nome && b_nome.indexOf(".")>-1){
        var b_nome = b_nome.substr(0, b_nome.indexOf("."));
        b_nome = parseFloat(b_nome);
    } else if (b_nome && b_nome.indexOf("-")>-1){
        var b_nome = b_nome.substr(0, b_nome.indexOf("-"));
        b_nome = parseFloat(b_nome);
    }

    if ( a_nome < b_nome ) return -1;
    if ( a_nome > b_nome ) return 1;
    return 0;
});

The code orders correctly.

However, for the name "06 - test" gets out of order. The strange thing is that it only happens to the number 06.

I am not able to find the error, because as mentioned the array is ordered correctly except by the numeral "06".