A local variable "highlight_regex" has been added in buffers.

It is recommended to use script buffer_autoset.py to set it, so that it's saved and set at any time when buffer is created.

However, it's still possible to set it manually (for testing) with command: /buffer set highlight_regex XXX.

For example, to highlight all messages on server freenode, channel #test:

/autosetbuffer add irc.freenode.#test highlight_regex .*