Hello. When using BetterChat plugin, no chat messages come through RustAdmin manager client.
If i disable plugin then they come through.

Console shows chat messages but not the Chat tab in the client.

You'd need to set a filter in RustAdmin that catches the chat from the console/logs. By default, RustAdmin looks for [chat], not [Better Chat].

I'm having trouble finding such option in RustAdmin files, by any chance you would know where?

Open RustAdmin, navigate to the Config tab, then the Regex should be there for the chat filter. 

^\[Better\sChat\]\s(?<sender>.*?):\s(?<message>.*)​

Thank you for the help so far. Unfortunately i'm still having trouble with it. I have tried your chat filter and 2 others that were recommended in the
program: 

Examples regex for BetterChat
^\[Oxide\]\s[0-9]{1,2}:[0-9]{1,2}\s((A|P)M\s)?\[.*?\]\s\[Better\sChat\]\s\[.*?\]\s(?.*?):\s(?.*)
^\[Oxide\]\s[0-9]{2}:[0-9]{2}\s\[Info\]\s\[Better\sChat\]\s(?.*?):\s(?.*)

Yet still no chat come through Oxide tab nor Chat tab.

Using [Oxide] anywhere in the regex will cause it to not work, as by default Oxide does not output that to the logs or console unless you enable those in the oxide.config.json. The example I provided previously should be all you need.

[Better\sChat\]\s\[.*?\]\s(?.*?):\s(?.*)

Should also work.

That last expression u gave me errored (nothing else worked either) and i have no clue how they work apart from understanding that \s is a space. I could give you my server RCON details and maybe u can try it out, would be greatly appriciated.

I noticed since today I no longer have chat messages in RustAdmin console.

But they are in the console section, just not in the chat section. What could be causing this?

See https://umod.org/community/79-better-chat/292-chat-not-showing-in-rustadmin?page=1#post-7.

Thank you for your reply but it's not doing anything for me.

In the bottom right I select Better Chat and then choose Show but it still only displays it in console and not in chat

goto Configuration -> Others tab -> chat message regex 
change to:
^\[Better\sChat\]\s\[.*?\]\s(?<sender>.*?):\s(?<message>.*)

or

^\[Better\sChat\]\s\[.*?\]\s\[.*?\]\s(?<sender>.*?):\s(?<message>.*)

if using the clan plugin

^\[Clans\]\s\[.*?\]\s(?<sender>.*?):\s(?<message>.*)

or

^\[.*\]\s\[.*?\]\s(?<sender>.*?):\s(?<message>.*)

Thank you for the very clear reply. Now I know what to do. Except the options are greyed out and i cannot change it?