这种带注释的 正则表达式 怎么写啊 ！

<!--[if gte mso 9]><xml>
 <o:DocumentProperties>
  <o:Author>li</o:Author>
  <o:LastAuthor>DELL</o:LastAuthor>
  <o:Revision>2</o:Revision>
  <o:TotalTime>8</o:TotalTime>
  <o:Created>2009-02-24T06:19:00Z</o:Created>
  <o:LastSaved>2009-02-24T06:19:00Z</o:LastSaved>
  <o:Pages>1</o:Pages>
  <o:Words>179</o:Words>
  <o:Characters>1024</o:Characters>
  <o:Lines>8</o:Lines>
  <o:Paragraphs>2</o:Paragraphs>
  <o:CharactersWithSpaces>1201</o:CharactersWithSpaces>
  <o:Version>11.5606</o:Version>
 </o:DocumentProperties>
</xml><![endif]--><!--[if gte mso 9]><xml>
 <w:WordDocument>
  <w:PunctuationKerning/>
  <w:DrawingGridVerticalSpacing>7.8 磅</w:DrawingGridVerticalSpacing>
  <w:DisplayHorizontalDrawingGridEvery>0</w:DisplayHorizontalDrawingGridEvery>
  <w:DisplayVerticalDrawingGridEvery>2</w:DisplayVerticalDrawingGridEvery>
  <w:ValidateAgainstSchemas/>
  <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid>
  <w:IgnoreMixedContent>false</w:IgnoreMixedContent>
  <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText>
  <w:Compatibility>
   <w:SpaceForUL/>
   <w:BalanceSingleByteDoubleByteWidth/>
   <w:DoNotLeaveBackslashAlone/>
   <w:ULTrailSpace/>
   <w:DoNotExpandShiftReturn/>
   <w:AdjustLineHeightInTable/>
   <w:BreakWrappedTables/>
   <w:SnapToGridInCell/>
   <w:WrapTextWithPunct/>
   <w:UseAsianBreakRules/>
   <w:DontGrowAutofit/>
   <w:UseFELayout/>
  </w:Compatibility>
  <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel>
 </w:WordDocument>
</xml><![endif]--><!--[if gte mso 9]><xml>
 <w:LatentStyles DefLockedState="false" LatentStyleCount="156">
 </w:LatentStyles>
</xml><![endif]-->
<style>
<!--
 /* Font Definitions */
 @font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;
mso-font-charset:2;
mso-generic-font-family:auto;
mso-font-pitch:variable;
mso-font-signature:0 268435456 0 0 -2147483648 0;}
@font-face
{font-family:宋体;
panose-1:2 1 6 0 3 1 1 1 1 1;
mso-font-alt:SimSun;
mso-font-charset:134;
mso-generic-font-family:auto;
mso-font-pitch:variable;
mso-font-signature:3 135135232 16 0 262145 0;}
@font-face
{font-family:"\@宋体";
panose-1:2 1 6 0 3 1 1 1 1 1;
mso-font-charset:134;
mso-generic-font-family:auto;
mso-font-pitch:variable;
mso-font-signature:3 135135232 16 0 262145 0;}
 /* Style Definitions */
 p.MsoNormal, li.MsoNormal, div.MsoNormal
{mso-style-parent:"";
margin:0cm;
margin-bottom:.0001pt;
text-align:justify;
text-justify:inter-ideograph;
mso-pagination:none;
font-size:10.5pt;
mso-bidi-font-size:12.0pt;
font-family:"Times New Roman";
mso-fareast-font-family:宋体;
mso-font-kerning:1.0pt;}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;
text-underline:single;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;
text-underline:single;}
 /* Page Definitions */
 @page
{mso-page-border-surround-header:no;
mso-page-border-surround-footer:no;}
@page Section1
{size:595.3pt 841.9pt;
margin:72.0pt 90.0pt 72.0pt 90.0pt;
mso-header-margin:42.55pt;
mso-footer-margin:49.6pt;
mso-paper-source:0;
layout-grid:15.6pt;}
div.Section1
{page:Section1;}
 /* List Definitions */
 @list l0
{mso-list-id:93064156;
mso-list-type:hybrid;
mso-list-template-ids:-432657902 67698689 67698691 67698693 67698689 67698691 67698693 67698689 67698691 67698693;}
@list l0:level1
{mso-level-number-format:bullet;
mso-level-text:\F06C;
mso-level-tab-stop:21.0pt;
mso-level-number-position:left;
margin-left:21.0pt;
text-indent:-21.0pt;
font-family:Wingdings;}
@list l0:level2
{mso-level-tab-stop:72.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level3
{mso-level-tab-stop:108.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level4
{mso-level-tab-stop:144.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level5
{mso-level-tab-stop:180.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level6
{mso-level-tab-stop:216.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level7
{mso-level-tab-stop:252.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level8
{mso-level-tab-stop:288.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level9
{mso-level-tab-stop:324.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
ol
{margin-bottom:0cm;}
ul
{margin-bottom:0cm;}
-->
</style>
<!--[if gte mso 10]>
<style>
 /* Style Definitions */
 table.MsoNormalTable
{mso-style-name:普通表格;
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.0pt;
font-family:"Times New Roman";
mso-ansi-language:#0400;
mso-fareast-language:#0400;
mso-bidi-language:#0400;}
</style>
<![endif]-->
例如以上代码 我只想 过滤掉 <!--[if   开头    <![endif]-->结尾的中间部分
其他的注释部分不过滤  正则表达式我该怎么写啊谢谢大家了！