Help with Regex and XML File

Hi, hoping I can get some quick help here. The following
chunk of code
appears within an XML file that I am opening and reading in
as a
string. I need to replace this entire section with a new
section
dynamically and I am having trouble using a regular
expression to
select this entire region (to be later used in a replace).

This is the regular expression I though would work.

<w:p.*(?=[INTRODUCTION])(.|n)*?</w:p>

Here is the chunk of code I want to identify.

<w:p wsp:rsidR="003061B7"
wsp:rsidRPr="008D3C80"
wsp:rsidRDefault="003061B7">
 <w:pPr>
  <w:rPr>
   <w:rFonts w:ascii="Tahoma"
w:h-ansi="Tahoma" w:cs="Tahoma"/>
   <wx:font wx:val="Tahoma"/>
   <w:sz w:val="20"/>
   <w:sz-cs w:val="20"/>
  </w:rPr>
 </w:pPr>
 <w:r wsp:rsidRPr="008D3C80">
  <w:rPr>
   <w:rFonts w:ascii="Tahoma"
w:h-ansi="Tahoma" w:cs="Tahoma"/>
   <wx:font wx:val="Tahoma"/>
   <w:sz w:val="20"/>
   <w:sz-cs w:val="20"/>
  </w:rPr>
  <w:t>[INTRODUCTION]</w:t>
 </w:r>
</w:p>

I have several sections that look identical, except they
have something
other than INTRODUCTION... Please help.


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