Match nth item of a string

[admin]

It makes more sense to find values by ID instead of position inside of the XML that can potentially change. Try this:

Code:

data = [[
<values>
  <item id='0x8764bc'>
      <item id='0x87676c'>
        <value>32.5°C</value>
      </item>
      <item id='0x87de1c'>
        <value>28.6°C</value>
      </item>
      <item id='0x87de64'>
        <value>28.4°C</value>
      </item>
      <item id='0x876724'>
        <value>62.7°C</value>
      </item>
  </item>
  <item id='0x876504'>
      <item id='0x8b7ab4'>
        <value>Aan</value>
      </item>
      <item id='0x87e0d4'>
        <value>Aan</value>
      </item>
  </item>
  <item id='0x8765dc'>
      <item id='0x878554'>
        <value>Uit</value>
      </item>
      <item id='0x861b84'>
        <value>Aan</value>
      </item>
      <item id='0x861bcc'>
        <value>Aan</value>
      </item>
      <item id='0x87850c'>
        <value>Aan</value>
      </item>
  </item>
</values>]]

function starttag(p, tag, attrs)
  if tag == 'item' then
    id = attrs.id
  elseif tag == 'value' then
    value = true
  end
end

function endtag(p, tag)
  if tag == 'item' then
    id = nil
  elseif tag == 'value' then
    value = nil
  end
end

function text(p, tdata)
  if value and id then
    values[ id ] = tdata
    value = nil
  end
end

values = {}

require('lxp').new({
  StartElement = starttag,
  EndElement = endtag,
  CharacterData = text,
}):parse(data)

log(values)