Get File Links on a Webpage

getFileLinks.js

function getURLFileExtension(url) {
    if (url && url.length > 0) {
        let results = url.match(/(?:[\d\w]+\.[\d\w]+)(?:\/.+)\.([^/]*)$/);
        if (results && results.length == 2) {
            return results[1];
        }
    }
    
    return undefined
}



[...document.querySelectorAll("a")]
    .map(e => e.href)
    .filter(href => href && href.length > 1)
    .map(href => ({ href, ext: getURLFileExtension(href)}))
    .filter(o => o.ext)
        .reduce((str, {href}) => str + href + "\n", "")