JS Regexp Weirdness.js

var msg = "(I did one for my site; see the logo:https://www.deadspin.com/5227676/stafford-welcomed-to-detroit-with-warm-prickly-arms)";

function linkURLs(str) {
    
    var regexp_url = /([^\w])((http(s?):\/\/)|(www\.))(\w+[^\s\)<]+)/gi;
    
    while ((ms = regexp_url.exec(str))) {
        if ( /\.$/.test(ms[6]) ) {
            period = '.';
            ms[6] = ms[6].slice(0, -1);
        }
        
        /*
            sometimes we can end up with a null instead of a blank string,
            so we need to force the issue in javascript.
        */
        for (x=0; x<ms.length; x++) {
            if (!ms[x]) {
                ms[x] = '';
            }
        }
        
        desc = ms[5]+ms[6];
    
        newstr = ms[1]+'<a href="http'+ms[4]+'://'+ms[5]+ms[6]+'">'+desc+'</a>';
        str = str.replace(ms[0], newstr);
    } 
    return str;
}

alert(linkURLs(msg));
​