[ogassav]

OK guys, looks like there's misunderstsanding here. I perfectly know what i need to implement in my formula: the logic which excludes 2 types of <BR>s. Call it skip logic, look behind assertions, ignore principles - whatever.

The problem is that i don't know how to translate this logic into Calibre language of regular expressions. So finally, the message of my post is "Is there anyone familiar with this kinda programming here? I've worked on some formula and got stuck on a certain stage - need your help badly". And believe me i've studied Calibre language help already and tried several variants with no result and i've wrote it in my very first post - so i tried to do something myself before asking for help, so just pushing me in the direction of User Manual is not what i really expect from the community in cases like this.