Hello everyone, I'm currently working on the development of this website using jQuery isotope, WordPress, and jQuery quicksearch. Everything is functioning perfectly, but I would like to enhance its functionality. For example, when I type "Mexico," I want the quicksearch to also work with "México." However, I'm not sure where to make the necessary edits.

Below is my JavaScript code for quicksearch:

$('input#busqueda').quicksearch('#contposts .item', {
                    'show': function() {
                        $(this).addClass('quicksearch-match');
                    },
                    'hide': function() {
                        $(this).removeClass('quicksearch-match');
                    },
                    }).keyup(function(){

                    if(bandera == 1){
                    $("#elpostloaded").fadeOut(400)
                    $("#content").delay(400).fadeIn(400,function(){
                        bandera = 0;
                    setTimeout( function() {

                        $contposts.isotope({ filter: '.quicksearch-match' })
                    }, 100 );
                    })
                    }
                    else{
                         setTimeout( function() {
                        $contposts.isotope({ filter: '.quicksearch-match' })
                    }, 100 );
                    }
                });

And here is the jQuery quicksearch plugin:

function($, window, document, undefined) {
    $.fn.quicksearch = function (target, opt) {

        var timeout, cache, rowcache, jq_results, val = '', e = this, options = $.extend({ 
            delay: 100,
            selector: null,
            stripeRows: null,
            loader: null,
            noResults: '',
            matchedResultsCount: 0,
            bind: 'keyup',
            onBefore: function () { 
                return;
            },
            onAfter: function () { 
                return;
            },
            show: function () {
                this.style.display = "";
            },
            hide: function () {
                this.style.display = "none";
            },
            prepareQuery: function (val) {
                return val.toLowerCase().split(' ');
            },
            testQuery: function (query, txt, _row) {
                for (var i = 0; i < query.length; i += 1) {
                    if (txt.indexOf(query[i]) === -1) {
                        return false;
                    }
                }
                return true;
            }
        }, opt);

        this.go = function () {

            var i = 0,
                numMatchedRows = 0,
                noresults = true, 
                query = options.prepareQuery(val),
                val_empty = (val.replace(' ', '').length === 0);

            for (var i = 0, len = rowcache.length; i < len; i++) {
                if (val_empty || options.testQuery(query, cache[i], rowcache[i])) {
                    options.show.apply(rowcache[i]);
                    noresults = false;
                    numMatchedRows++;
                } else {
                    options.hide.apply(rowcache[i]);
                }
            }

            if (noresults) {
                this.results(false);
            } else {
                this.results(true);
                this.stripe();
            }

            this.matchedResultsCount = numMatchedRows;
            this.loader(false);
            options.onAfter();

            return this;
        };

        /*
         * External API so that users can perform search programmatically. 
         * */
        this.search = function (submittedVal) {
            val = submittedVal;
            e.trigger();
        };

        /*
         * External API to get the number of matched results as seen in 
         * https://github.com/ruiz107/quicksearch/commit/f78dc440b42d95ce9caed1d087174dd4359982d6
         * */
        this.currentMatchedResults = function() {
            return this.matchedResultsCount;
        };

        this.stripe = function () {

            if (typeof options.stripeRows === "object" && options.stripeRows !== null)
            {
                var joined = options.stripeRows.join(' ');
                var stripeRows_length = options.stripeRows.length;

                jq_results.not(':hidden').each(function (i) {
                    $(this).removeClass(joined).addClass(options.stripeRows[i % stripeRows_length]);
                });
            }

            return this;
        };

        this.strip_html = function (input) {
            var output = input.replace(new RegExp('<[^<]+\>', 'g'), "");
            output = $.trim(output.toLowerCase());
            return output;
        };

        this.results = function (bool) {
            if (typeof options.noResults === "string" && options.noResults !== "") {
                if (bool) {
                    $(options.noResults).hide();
                } else {
                    $(options.noResults).show();
                }
            }
            return this;
        };

        this.loader = function (bool) {
            if (typeof options.loader === "string" && options.loader !== "") {
                 (bool) ? $(options.loader).show() : $(options.loader).hide();
            }
            return this;
        };

        this.cache = function () {

            jq_results = $(target);

            if (typeof options.noResults === "string" && options.noResults !== "") {
                jq_results = jq_results.not(options.noResults);
            }

            var t = (typeof options.selector === "string") ? jq_results.find(options.selector) : $(target).not(options.noResults);
            cache = t.map(function () {
                return e.strip_html(this.innerHTML);
            });

            rowcache = jq_results.map(function () {
                return this;
            });

            /*
             * Modified fix for syncing "val". 
             * Original fix https://github.com/michaellwest/quicksearch/commit/4ace4008d079298a01f97f885ba8fa956a9703d1
             * */
            val = val || this.val() || "";

            return this.go();
        };

        this.trigger = function () {
            this.loader(true);
            options.onBefore();

            window.clearTimeout(timeout);
            timeout = window.setTimeout(function () {
                e.go();
            }, options.delay);

            return this;
        };

        this.cache();
        this.results(true);
        this.stripe();
        this.loader(false);

        return this.each(function () {

            /*
             * Changed from .bind to .on.
             * */
            $(this).on(options.bind, function () {

                val = $(this).val();
                e.trigger();
            });
        });

    };

}(jQuery, this, document));

Any assistance would be greatly appreciated!