Solr - how do I index barcode

[Mysurf Mail]

I have a documnet that contains the following data

car {
    id:     guid
    name:   string
    sku:   list<barcode>
}

Now, The barcodes dont have a pattern. It can be either one of the
follwings:

ABCD-EF34GD-JOHN
ABCD-C08-YUVF

I want to index my documents so that search for
1. ABCD will return both.
2. AB will return both.
3. JO - will return ABCD-EF34GD-JOHN but not car with name john.

so far I have defined car and sku as text_en.
But I dont get bulletes no 2 and 3.
IS there a better way to define sku attribute.
Thanks.