Building a Hashtag in Javascript without matching Anchor Names, BBCode or Escaped Characters

Posted by Martindale on Stack Overflow See other posts from Stack Overflow or by Martindale
Published on 2010-04-30T14:43:16Z Indexed on 2010/04/30 16:47 UTC
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JavaScript

|

regex

I would like to convert any instances of a hashtag in a String into a linked URL:

#hashtag -> should have "#hashtag" linked.
This is a #hashtag -> should have "#hashtag" linked.
This is a [url=http://www.mysite.com/#name]named anchor[/url] -> should not be linked.
This isn't a pretty way to use quotes -> should not be linked.

Here is my current code:

String.prototype.parseHashtag = function() {
 return this.replace(/[^&][#]+[A-Za-z0-9-_]+(?!])/, function(t) {
  var tag = t.replace("#","")
  return t.link("http://www.mysite.com/tag/"+tag);
 });
};

Currently, this appears to fix escaped characters (by excluding matches with the amperstand), handles named anchors, but it doesn't link the #hashtag if it's the first thing in the message, and it seems to grab include the 1-2 characters prior to the "#" in the link.

Halp!

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