JavaScript URI parser in regular expressions

URIParser.js

function parseURI(url) {
        var m = String(url).replace(/^\s+|\s+$/g, '').match(/^([^:\/?#]+:)?(\/\/(?:[^:@]*(?::[^:@]*)?@)?(([^:\/?#]*)(?::(\d*))?))?([^?#]*)(\?[^#]*)?(#[\s\S]*)?/);
        // authority = '//' + user + ':' + pass '@' + hostname + ':' port
        return (m ? {
            href: m[0] || '',
            protocol: m[1] || '',
            authority: m[2] || '',
            host: m[3] || '',
            hostname: m[4] || '',
            port: m[5] || '',
            pathname: m[6] || '',
            search: m[7] || '',
            hash: m[8] || ''
        } : null);
  }