How to make Chosen ignore accents in the search?

I'm using Chosen in my forms, but I'd like it to ignore the accents when filtering.

For example: In a city listing, filter it correctly to:

- africa

But it does not filter for (as words differ by accent):

- africa

On the project's GitHub, there have been discussions about this since 12/03/2012 ( link ), but have not yet implemented this in the official code.

Reading the existing discussions, I found this working example, posted by @felpasl :

• Example working: link

However, I intend to implement it, but without changing the original source code, to minimize future complications when updating the code from the official repository.

I thought of replacing the method externally, but I can not do it. Below the code I tried, to override the method ...

var Chosen = $('#campo_select_com_chosen').chosen();
Chosen.prototype.search_string_match = function (search_string, regex) {
    alert('Método substituído com sucesso');
};

But I get this error:

  

Uncaught TypeError: Can not set property 'search_string_match' of undefined

My problem is how to replace a method of the lib I'm using without changing its fonts. If it were in PHP I would inherit the class and override the method ... but in JavaScript I do not know how to do it.

Can anyone help me on how to do this implementation, type PlugIn, in Chosen?