How to remove non-printable characters from a string?

Question

Lua

I add this to the end of the line

function zero_padding_add(data, blocksize)
  local pad = blocksize - math.fmod(#data, blocksize)
  return data .. string.rep('\0', pad)
end

but i can't remove it :(

function zero_padding_remove(data)
  return string.gsub(data, '%\0+', '')
end

Of course, I would like to remove

p / s from the end of the line; this is necessary so that the line is always a multiple of a certain number

Answer 1

Just remove all "null" characters:

function zero_padding_remove(data)
  return string.gsub(data, '\0+', '')
end

Remove only at the end of the line:

function zero_padding_remove(data)
  return string.gsub(data, '\0+$', '')
end