Module development and code questions

I'm working on a cloaking module which hides email addresses (as per my conversation and layout in Privacy/security of a website).

I've run into a small road block, since I'm not the greatest coder. I've got the basic structure in place, and associated functions burned in. However, I'm having a hard time modifying the eregi_replace() call (as ripped from the HTML filters) to call a function to act on the filtered/replaced text. Here's what I'm looking at:

$text = eregi_replace("([ \n\r\t])([A-Za-z0-9._]+@[A-Za-z0-9._]+\.[A-Za-z]{2,4})([.,]?)([ \n\r\t])", '\2', $text)&#59;

What I need to do is have the "\2" matched text passed through a function. So I tried something like:

$text = eregi_replace("([ \n\r\t])([A-Za-z0-9._]+@[A-Za-z0-9._]+\.[A-Za-z]{2,4})([.,]?)([ \n\r\t])", cloak_address('\2'), $text)&#59;

One of the custom node modules I am developing for my site requires the ability to customize the "teaser". Rather than take the first "x" bytes as specified in the parameters for the node module - this module needs to provide the user with the ability to write their own teaser. Is there a hook or other method that would allow a module to set the content of the teaser and override the default behavior?

I'm working on an email cloaking module, as per the conversation thread at:

http://drupal.org/node/view/3907

Towards the end where I commented with some specifications.

I fixed the Amazon Mod to work in 4.3, it is posted at:

http://drupal.org/node/view/4019

Good Luck

Barney

How would I go about changing and/or adding user account fields? For example, if I want to keep track of users' favorite kind of ice cream?

Is this something I could do through a theme, along with changing the mysql database, or is something else required?

I found this post and I would like to do this to my site, but in marvin.theme I don't see the code listed in that post.

I'm using marvin as a theme and drupal 4.2.0

I just want to make the node titles links and get rid of the "read more" and "visit" links.

Thanks in advance.