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      + '|<!\\[CDATA\\[[\\s\\S]*?\\]\\]>'  // a CDATA section
      // a probable tag that should not be highlighted
      + '|<\/?[a-zA-Z](?:[^>\"\']|\'[^\']*\'|\"[^\"]*\")*>'
      + '|<',  // A '<' that does not begin a larger chunk
      'g');
  var pr_commentPrefix = /^<\!--/;
  var pr_cdataPrefix = /^<!\[CDATA\[/;
  var pr_brPrefix = /^<br\b/i;
  var pr_tagNameRe = /^<(\/?)([a-zA-Z][a-zA-Z0-9]*)/;

  /** split markup into chunks of html tags (style null) and
    * plain text (style {@link #PR_PLAIN}), converting tags which are
    * significant for tokenization (<br>) into their textual equivalent.
    *
    * @param {string} s html where whitespace is considered significant.
    * @return {Object} source code and extracted tags.
    * @private
    */
  function extractTags(s) {
    // since the pattern has the 'g' modifier and defines no capturing groups,
    // this will return a list of all chunks which we then classify and wrap as