Need a regex to remove outer function

I need to remove require.js from a bunch of files. The rest of the code needs to be preserved, and theres plently of nested functions, etc, which complicates things. I've pasted a sample below, basically I need 'use strict' to be the first line of code, and also strip the final }); from the code. Using sublime text 2. any regex or other ideas how to accomplish this?

EDIT: Need to remove everything before 'use strict' in example below, as well as closing }); Code in between, everything below 'use strict' except for the final closing }); needs to be left in tact. That code does contain functions and objects which complicate things. Example of what code may look like:

define([
    'backbone',
    'common',
    'marionette',
    'bootstrap'
],
function (Backbone, Common) {

    'use strict';

    var foo = 'stuff';

    foo = Backbone.Marionette.ItemView.extend({

        template: 'stuff',

        className: 'more stuff',

        events: {
            "click #a": "s"
        },

        s: function () {

            //
            // On click of a button, hide the modal
            //

            this.$el.modal('hide');
        }

    });

});