HELP: Regex pattern matching

I have an ASCII file which has multiple blocks of text I want to clear. The scheme is as follows: =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- line 1 Everything between the separators, line 2 including the separators line 3 I want to clear from the text file line 4 ----------------------------------------------------- This text I want to keep There are infinite number of blocks surrounded by exactly the same separators. So, I guess I need to clear everything between the starting "=" and the ending "-". Can anyone suggest a regex pattern string that would help me accomplish that? Thank you all guys in advance! Nasko