UltraEdit, UltraCompare, UEStudio forums

I need to insert a 3rd line between 2 specific lines when they appear in sequence. I can easily find the 2 lines with a regex, but how do I then insert the 3rd between them, short of learning Perl? Can this be done in Ulra Edit somehow? I could do it in most cases if I could use a newline in the "re...