Add backslash to valid nick chars

Author: linuxdaemon

cloudbot/clients/irc.py

@@ -16,7 +16,7 @@
 irc_netmask_re = re.compile(r"([^!@]*)!([^@]*)@(.*)")
 irc_param_re = re.compile(r"(?:^|(?<= ))(:.*|[^ ]+)")
 
-irc_nick_re = re.compile(r'[A-Za-z0-9^{\}\[\]\-`_|]')
+irc_nick_re = re.compile(r'[A-Za-z0-9^{\}\[\]\-`_|\\]')
 
 irc_bad_chars = ''.join([chr(x) for x in list(range(0, 1)) + list(range(4, 32)) + list(range(127, 160))])
 irc_clean_re = re.compile('[{}]'.format(re.escape(irc_bad_chars)))