Authors CurseForge

Quote from Goranaws

First you would need to create a frame to handle the necessary code:

local frame = CreateFrame("Frame", "MyFrameName")

Then you set the frame to register the event called "CHAT_MSG_CHANNEL". This will allow you to retrieve the information you want.

frame:RegisterEvent("CHAT_MSG_CHANNEL")

Once you have registered the event, you can set your frame to receive the script:

frame:SetScript("OnEvent", function(self, event, arg1, arg2, arg3, arg4, arg5, ...)
     --your code inside goes here.
end)

You can get more info from here: http://www.wowpedia.org/Events/Communication
Look for the event called "CHAT_MSG_CHANNEL"

Quote from Farmbuyer

Those are generated from different events. For example, CHAT_MSG_GUILD fires for messages to /g, CHAT_MSG_RAID and CHAT_MSG_RAID_LEADER for messages to /ra (depending on who is typing the message), and so forth.

CHAT_MSG_CHANNEL is for the numbered channels, like General or channels you've joined by typing /join.

The same handler function can be used for all of those events, simply be careful how you're treating the event parameters ("arg1", etc).

Button:RegisterEvent("CHAT_MSG_GUILD")
Button:RegisterEvent("CHAT_MSG_OFFICER")
Button:RegisterEvent("CHAT_MSG_BATTLEGROUND")
Button:RegisterEvent("CHAT_MSG_BATTLEGROUND_LEADER")
Button:RegisterEvent("CHAT_MSG_PARTY")
Button:RegisterEvent("CHAT_MSG_RAID_LEADER")
Button:RegisterEvent("CHAT_MSG_RAID")
Button:RegisterEvent("CHAT_MSG_WHISPER")
Button:RegisterEvent("CHAT_MSG_BN_WHISPER")
Button:RegisterEvent("CHAT_MSG_CHANNEL")
Button:RegisterEvent("CHAT_MSG_SAY")

Button:SetScript("OnEvent", function(self, event, msg, sender, _, chanString, _, _, _, chanNumber, chanName)
    if message ~= nil then
    local mas = {"!mop","!mists","!pandaria","!panda"}
       for i=1,#mas do
           local startPos, endPos = string.find(msg,mas[i]);
           if startPos ~= nil then 
             if string.sub(msg,startPos,endPos) == mas[i] then 
                if chanNumber > 0 then SendChatMessage(Report,"CHANNEL",nil,chanNumber) else SendChatMessage(Report,"GUILD") 
               end
             end
           end 
         end