code snippet about naver dictionary request in javascript

ndic.js

new Promise((resolve, reject) => {
        var xhr = new XMLHttpRequest();
        xhr.open("GET", `https://endic.naver.com/searchAssistDict.nhn?query=${text}`, true);
        xhr.onreadystatechange = function() {
            if (xhr.readyState == 4) {
                const content_word = /<div class="box_a">((.|\n)*?)<\/div>/g
                const filter_word = /<span class="fnt_k20"><strong>(.+)<\/strong><\/span>/g

                const body = xhr.responseText;
                let words = [];

                body.replace(content_word, function(match, p1) {
                    p1.replace(filter_word, function(match2, p2) {
                        if (p2.match(/<|>/) == null) {
                            words.push(p2);
                        }
                    });
                });

                resolve(words.join('\n'));
            }
            // TODO: reject
        }
        xhr.send();
    })