AFD-replacement

// ==UserScript==
// @name        Replace Text
// @namespace   Replace text
// @version     1
// @grant       none
// ==/UserScript==
(function () {
  var replacements,
  regex,
  key,
  textnodes,
  node,
  s;
  replacements = {
    'AfD': '卐',
    'AFD': '卐',
    'afd': '卐',
  };
  regex = {
  };
  for (key in replacements) {
    regex[key] = new RegExp(key, 'g');
  }
  textnodes = document.evaluate('//body//text()', document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
  for (var i = 0; i < textnodes.snapshotLength; i++) {
    node = textnodes.snapshotItem(i);
    s = node.data;
    for (key in replacements) {
      s = s.replace(regex[key], replacements[key]);
    }
    node.data = s;
  }
}) ();