Find entries that contain a certain string

[stefaneichert]

Hi and first of all thanks for the great work on this library!
I could not figure out yet if there is a way to find entries that contain a certain string.
With the starting letter it works well:
var family = jsonQ(myjson);
var result = family.find('name', function () {
return this[0] == 'f'
});
This will of course return all entries that start with an f. Is there a way to use wildcards or such to query entries that contain a certain string e.g. return this == '%xyz%''
and return for example all entries that are like "foo xyz bar", "barfoo xyz" etc...

Thank you very much in advance!
Stefan