irc: use extended regex in command /list

ChangeLog

@@ -44,6 +44,7 @@ Version 0.3.7 (under dev!)
   hashtable_map_string, hdata_check_pointer, hdata_char, hdata_hashtable and
   nicklist_get_next_item
 * alias: add default alias umode => /mode $nick
+* irc: use extended regex in command /list
 * irc: use redirection to get channel modes after update of modes on channel,
   display output of /mode #channel, allow /mode without argument (display modes
   of current channel or user modes on server buffer)

src/plugins/irc/irc-command.c

@@ -2246,7 +2246,7 @@ irc_command_list (void *data, struct t_gui_buffer *buffer, int argc,
                 if (ptr_server->cmd_list_regexp)
                 {
                     if ((ret = regcomp (ptr_server->cmd_list_regexp, ptr_regex,
-                                        REG_NOSUB | REG_ICASE)) != 0)
+                                        REG_NOSUB | REG_ICASE | REG_EXTENDED)) != 0)
                     {
                         regerror (ret, ptr_server->cmd_list_regexp,
                                   buf, sizeof(buf));