turning a tweet into html

tweetToHTML.js

function htmlify( tweet ) {
  return tweet.replace(
    /[@]+([A-Za-z0-9-_]+)|[#]+([A-Za-z0-9-_]+)|(\b(?:https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig,
    function( match, user, tag, url ) {
      return 0,
        user ? "@" + user.link( "http://twitter.com/" + user ) :
        tag ? "#" + tag.link( "http://search.twitter.com/search?q=%23" + tag ) :
        url ? url.split( "//" )[ 1 ].link( url ) : ""
    })
}

fwiw, I found this in an old project of mine:

   // goes into String.prototype
   unescapeHTML: function() {
      return this.replace(/&lt;/g,'<').replace(/&gt;/g,'>').replace(/&amp;/g,'&');
    },

   autolink: function(){
      var URL = /\b((?:[a-z][\w-]+:(?:\/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}\/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'".,<>?«»“”‘’]))/i;
      return this.gsub(URL, function(part){
        return '<a href="'+part[0].unescapeHTML()+'" target="_new">'+part[0]+'</a>';
      });
    }

(oh, this assumes a gsub implementation like in Prototype)