Function: Callback to convert mention matches to HTML A tag.

Function: Catches links so rel=nofollow can be added (on output, not save)

Function: Adds rel=nofollow to a link

Function: Convert plaintext URI to HTML links.

Function: Make URLs clickable in content areas

Function: Callback to decode the tags in topic or reply content

Function: Callback to replace empty HTML tags in a content string

Function: Callback to replace normal HTML tags in a content string

Function: Filter the topic or reply content and output code and pre tags

Function: When editing a topic or reply, reverse the code trick so the textarea contains the correct editable content.