text highlight

// ==UserScript==
// @name         bbcode_hg
// @namespace    -
// @version      0.1
// @description  Highlight para as mensagens do chat do jogo
// @author       Eshkation
// @match        *atelier801.com/*
// ==/UserScript==

$(document).ready(function(){
    $('#outils_message_reponse > .groupe-boutons-barre-outils:last-child').prepend(`
        <button type="button" class="btn btn-reduit btn-success" id="highlight-text">
            Highlight
        </button>
    `);

    $(document).on('click', '#highlight-text', function(){
        var text_final = '[font=Verdana][size=11][color=#92AFCF]';
        var text_lines = window.getSelection().toString();
        text_lines = text_lines.split('\n');
        for (i = 0; i < text_lines.length; i++) {
            var line = text_lines[i];
            line = line.replace(/\[([A-Za-z0-9\_\+]{3,20})\]/, '[[color=#317FBA]$1[/color]]');
            text_final += line+'\n';
        }
        text_final += '[/color][/size][/font]';
        var textarea = $(window.getSelection().anchorNode.parentNode).find('textarea');
        $(textarea).val(text_final);
        console.log(text_final);
    });
});