Hi, I have been using Drutex to support mediawiki page import but mathematical formulas in mediawiki uses tag instead of $ $. To suport mediawiki math tag I included the following code to drutex_render.inc around line 114.

  /* <math> environment */
  $E[] = (object) array(
      'pattern' => '@<math( [^>]*)?>(.+?)</math>@se',
      'replacement' => "'$1' . drutex_render('$ $2 $', '<var>format</var>')",
      'weight' => -8
    );

I think that this support could be useful to others that import mediawiki pages into drupal.