Not sure if it's the same bug, but it looks very similar: $ echo "ab" | less -p'((a([^a]))|(b([^b])))' *** Error in `less': double free or corruption (fasttop): 0x000000000184cb60 *** Aborted (core dumped)
This is less 458-2 on Ubuntu 14.04 amd64, but maybe it reproduces in Debian too (I don't have access to a Debian Testing at the moment). Hope this helps, -=[david]=-
