save string to variable from slash command?

[daylighted]

currently my slash command looks like this, and what i want to happen is in comments/pseudocode

local function MyAddonCommands(msg, editbox)
    if msg == "test" then
        --str1 = everything written after "test" 
    end

SLASH_HELLOWORLD1, SLASH_HELLOWORLD2 = "/test1", "/test2"

SlashCmdList["HELLOWORLD"] = MyAddonCommands

so basically, if i type

/test1 test save this string

i want "save this string" to be saved to a variable

could someone help me out on how to do this?