Anti-Caps System

[Cupex]

I wondered if it would be possible to block player's from writing in Caps but if the player writes a player name with Caps in it, the message doesnt get blocked.

I tried to make this:

on chat:
    if player doesn't have permission "FlowMC.caps.bypass":
        loop all players:
            if message contains "%loop-player%":               
                if length of regex replace "[^A-Z]" with "" in message >= 20:
                    cancel event
                    send "&8〣 &6Flow&eMC &8» &7Bitte hör auf in &c&lCAPS &7zu schreiben!"
                    stop
            else:
                if length of regex replace "[^A-Z]" with "" in message >= 6:
                    cancel event
                    send "&8〣 &6Flow&eMC &8» &7Bitte hör auf in &c&lCAPS &7zu schreiben!"
                    stop

but it just don't work. The name is blocked anyway...
Is there any way to do it?