isUrl

gistfile1.txt

_isUrl = function (str) {

    // pass --> http://google.com
    // pass --> ftp://google.com
    // pass --> google.com
    // pass --> localhost
    // pass --> 127.0.0.1
    // pass --> 1.1.1.1
    // pass --> http://127.0.0.1
    // pass --> http://localhost
    // fail --> foo
    // fail --> http://foo
    // pass --> http://
    // fail --> http:dfsdgfg.com
    // pass --> a.io
    //
    // Author: Diego Perini
    // Updated: 2010/12/05
    // License: MIT
    //
    // Copyright (c) 2010-2013 Diego Perini (http://www.iport.it)
    // https://gist.github.com/dperini/729294
    // modified by Asa Baylus to accomodate a wider range of URLs
    if (typeof str === 'undefined') {
        return new Error('_isUrl: no arguments provided');
    }
    return /^(?:(?:https?|ftp|):\/\/)?(localhost|127\.0\.0\.1)?(?:\S+(?::\S*)?@)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)?(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))?(?::\d{2,5})?(?:\/[^\s]*)?$/i.test(str);
};