@stuff = m#(?:[^\\]|^)(\$(?:[a-zA-z_][a-zA-z0-9]*|[0-9]))#g;

##</code><code>##

      \$x;    # A reference to $x, but ignored by regexp
      ${x};   # Same as $x, but ignored
      $x[10]; # Shows up as $x, but is really @x