Small script for a measurement of url parsing speed by RegEx and by <a> DOM-element

url-parsing-speed.js

function parseByRegEx (url) {
    var parser = /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/,
        parserKeys = ['source', 'protocol', 'authority',
                      'userInfo', 'user', 'password', 'host', 'port',
                      'relative', 'path', 'directory', 'file', 'query', 'anchor'],
        m = parser.exec(url || ''),
        parts = {};

    parserKeys.forEach(function(key, i) {
        parts[key] = m[i] || '';
    });
    
    return parts;
};

function parseByDOM (url) {
    var link = window.document.createElement('a'),
        parserKeys = ['href', 'protocol', 'hostname', 'port',
                      'pathname', 'search', 'hash'],
        parts = {};
    
    link.setAttribute('href', url);
    parserKeys.forEach(function(key, i) {
        parts[key] = link[key] || '';
    });
    
    return parts;
};

var domStartTime = Date.now();
for (var i=0; i < 1000; i++) { 
    parseByDOM('m.news.yandex.ru/yandsearch?rpt=nnews2&amp;grhow=clutop&amp;text=ololo#' + Date.now());
}
var domStopTime = Date.now();
console.log('DOM parser', domStopTime - domStartTime);

var regExStartTime = Date.now();
for (var i=0; i < 1000; i++) { 
    parseByRegEx('m.news.yandex.ru/yandsearch?rpt=nnews2&amp;grhow=clutop&amp;text=ololo#' + Date.now());
}
var regExStopTime = Date.now();
console.log('RegEx parser', regExStopTime - regExStartTime);