twitter regex parsing

gistfile1.php

<?php
/**
 * Regex's a twitter message to make it have links like all the cool kids.
 *
 * ex.
 *    @username = http://twitter.com/username
 *    #hashtag = http://twitter.com/search?q=%23hashtag
 *    http://something = <a href....
 *
 * @author Nat Welch
 */
function twitterParse($in)
{
   $pieces = explode(" ", $in);

   foreach($pieces as &$word)
   {   
      if($word) {
         if($word[0] == "@") 
            $word = "<a href=\"http://twitter.com/" . preg_replace("/(@|[^[:alnum:]])/","",$word) . "/\" >" . $word . "</a>";
         else if($word[0] == "#") 
            $word = '<a href="http://twitter.com/search?q=%23' . preg_replace("/#/","",$word) . '" >' . $word . "</a>";
         else if($word[0] == "h") 
            $word = preg_replace('`((?:https?|ftp)://(\S+[[:alnum:]])/?)`','<a href="$1" alt="\2">\1</a>', $word);
      }   
   }

   return implode(" ",$pieces);
}
?>

gistfile2.js

function twitterCallback2(twitters) {
  var statusHTML = [];
  for (var i=0; i<twitters.length; i++){
    var username = twitters[i].user.screen_name;
    var status = twitters[i].text.replace(/((https?|s?ftp|ssh)\:\/\/[^"\s\<\>]*[^.,;'">\:\s\<\>\)\]\!])/g, function(url) {
      return '<a href="'+url+'">'+url+'</a>';
    }).replace(/\B@([_a-z0-9]+)/ig, function(reply) {
      return  reply.charAt(0)+'<a href="http://twitter.com/'+reply.substring(1)+'">'+reply.substring(1)+'</a>';
    });
    statusHTML.push('<li><span>'+status+'</span> <a style="font-size:85%" href="http://twitter.com/'+username+'/statuses/'+twitters[i].id+'">'+relative_time(twitters[i].created_at)+'</a></li>');
  }
  document.getElementById('twitter_update_list').innerHTML = statusHTML.join('');
}

function relative_time(time_value) {
  var values = time_value.split(" ");
  time_value = values[1] + " " + values[2] + ", " + values[5] + " " + values[3];
  var parsed_date = Date.parse(time_value);
  var relative_to = (arguments.length > 1) ? arguments[1] : new Date();
  var delta = parseInt((relative_to.getTime() - parsed_date) / 1000);
  delta = delta + (relative_to.getTimezoneOffset() * 60);

  if (delta < 60) {
    return 'less than a minute ago';
  } else if(delta < 120) {
    return 'about a minute ago';
  } else if(delta < (60*60)) {
    return (parseInt(delta / 60)).toString() + ' minutes ago';
  } else if(delta < (120*60)) {
    return 'about an hour ago';
  } else if(delta < (24*60*60)) {
    return 'about ' + (parseInt(delta / 3600)).toString() + ' hours ago';
  } else if(delta < (48*60*60)) {
    return '1 day ago';
  } else {
    return (parseInt(delta / 86400)).toString() + ' days ago';
  }
}