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  wordchar = [^\x00-\x20];

  spacechar = [ \t\v\f\r\n];

  reg_char     = [^\\()\x00-\x20];

  escaped_char = [\\][!"#$%&'()*+,./:;<=>?@[\\\]^_`{|}~-];

  tagname = [A-Za-z][A-Za-z0-9-]*;

  blocktagname = 'address'|'article'|'aside'|'base'|'basefont'|'blockquote'|'body'|'caption'|'center'|'col'|'colgroup'|'dd'|'details'|'dialog'|'dir'|'div'|'dl'|'dt'|'fieldset'|'figcaption'|'figure'|'footer'|'form'|'frame'|'frameset'|'h1'|'head'|'head...

  attributename = [a-zA-Z_:][a-zA-Z0-9:._-]*;

  unquotedvalue = [^\"'=<>`\x00]+;
  singlequotedvalue = ['][^'\x00]*['];
  doublequotedvalue = [\"][^\"\x00]*[\"];

  attributevalue = unquotedvalue | singlequotedvalue | doublequotedvalue;

  attributevaluespec = spacechar* [=] spacechar* attributevalue;