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Yuri Takhteyev wrote:
I am wondering why you find this omission so shocking?  When I ran
into the need for a function like this myself, I just added it in my
own app and moved on:

    function escape(text)
        return (text or ""):gsub("&", "&amp;"):gsub(">","&gt;"):gsub("<","&lt;")

Or this alternative:

function escape(text)
  local escaped = { ['<']='&lt;', ['>']='&gt;', ["&"]='&amp;' }
  return text:gsub('[<>&]', function(c) return escaped[c] end)

print(escape('2 < 3 & 10 > 9'))