[libreoffice-users] LO Writer and regex - finding "everything" but one thing

Hello everybody.
Probably the title of this post is not very clear, sorry for that ;).

I have a bunch of text (html code) and need to find <p> tags with their 
classes, id, styles (if any) etc. I'm doing this using the following regexs:
<p(.*?)> or (<p([^>]+))>

The pattern of my text is here:

<p class="navi_buttons">Lorem ipsum dolor sit amet, consectetur 
adipiscing elit.</p>

<p class="reg">Aliquam mi sapien, rutrum eget sem vel, semper 
efficitur.<a href="xyz.html" class="topiclink">vitae velit</a></p>

<p class="THIS_SHOULD_BE_AVOIDED">Donec fringilla sapien vitae interdum 
volutpat.</p>

<p class="nav">Cras nec orci non dolor ultrices luctus sit amet vitae 
velit.</p>


The problem is that I need to find every occurrence of <p> tag except 
one certain class (i.e. I want to avoid paragraph tags of this class). I 
don't know how to write a regex exclusion that is treated as a string, 
not a set of the individual characters? I tried to use back-references, 
with no success. I want to use regex because the tag classes, to be 
avoided, are different on each page (but they keep a certain pattern) 
and a the job should be done as automatic as possible (the code should 
be as versatile as possible).
I will appreciate any help. Kind regards,

gordom

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