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This page documents a user-defined function that you can copy and paste into your addon. Replace PREFIX with your addon or lib prefix to avoid conflicts between different versions of these functions.
User defined functions

Takes a hex string (must be 6 char long!) and converts it to a RGB set (0-255)

local function HexToRGB(hex)
	local rhex, ghex, bhex = string.sub(hex, 1, 2), string.sub(hex, 3, 4), string.sub(hex, 5, 6)
	return tonumber(rhex, 16), tonumber(ghex, 16), tonumber(bhex, 16)
end

Alternative version Edit

Takes a hex string (must be 3 or 6 chars long!) and converts it to a RGB set (0-255). If hex is invalid, return black (0,0,0).

local function HexToRGB(hex)
    local rhex, ghex, bhex
    if strlen(hex) == 6 then
        rhex, ghex, bhex = strmatch('([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})', hex)
    elseif strlen(hex) == 3 then
        rhex, ghex, bhex = strmatch('([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])', hex)
        if rhex and ghex and bhex then
            rhex = rhex .. rhex
            ghex = ghex .. ghex
            bhex = bhex .. bhex
        end
    end
    if not (rhex and ghex and bhex) then
        return 0, 0, 0
    else
        return tonumber(rhex, 16), tonumber(ghex, 16), tonumber(bhex, 16)
    end
end
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