gistfile1.lua

-- lua has no split string, so we need to write our own
-- explode(seperator, string)
local explode = function(d,p)
  local t, ll, l
  t={}
  ll=0
  if(#p == 1) then return {p} end
    while true do
      l=string.find(p,d,ll,true) -- find the next d in the string
      if l~=nil then -- if "not not" found then..
        table.insert(t, string.sub(p,ll,l-1)) -- Save it in our array.
        ll=l+1 -- save just after where we found it for searching next time.
      else
        table.insert(t, string.sub(p,ll)) -- Save what's left in our array.
        break
      end
    end
  return t
end

-- fetch all keys, explode them on :, and do some fake action
res = redis.call('keys', '*')
for key, value in pairs(res)
  do
    -- assume key is something like 'some name:123'
    local keyPieces = explode(':', value)
  	local num = tonumber(keyPieces[2])    
  	if(num == nil or (keyPieces[1] == 'some name' and num < 500)) then  
	    -- take some action if the format matches, the key is named, and the integer is below 500
	  end
  end
return 1