[colorize_nicks.py] colorizes the middle of a word
There's a user with nick e in the #vim channel on FreeNode. This results in

What is strange to me is that only the e in new is highlighted: the e in maybe, or open or files or :tabe or :e are not highligted (nor should they be! except maybe the e in :e might make sense).
What value do you have set for colorize_nicks.look.greedy_matching? By default it is on but I've found off` to work better in general, maybe that also fixes this.
Also what value do you have for colorize_nicks.look.min_nick_length? By default it should be 2, so just "e" shouldn't ever be handled. Unless the issue is deeper than that.
I don't remember ever changing any settings. ~/.weechat/colorize_nicks.conf has
[look]
blacklist_channels = ""
blacklist_nicks = "so,root"
colorize_input = off
greedy_matching = on
ignore_nicks_in_urls = off
ignore_tags = ""
match_limit = 20
min_nick_length = 2
Looking at the code, I think I see how the min_nick_length can be circumvented: the length check happens before the
# If the matched word is not a known nick, we try to match the
# word without its first or last character (if not a letter).
# This is necessary as "foo:" is a valid nick, which could be
# adressed as "foo::".
logic, which then cuts off the first : in :e.
disable greedy_matching first: /set colorize_nicks.look.greedy_matching off