regex specific tags from text?

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C#

regular-expression

string

i have the following text

<fieldset>
<ul id="ContentPlaceHolder2_1g" class="profList column ui-sortable">
<legend class="group">المجموعه 1</legend>
<li id="ContentPlaceHolder2_8">محمود حسن ابراهيم عبد الصمد</li>
</ul></fieldset>



<fieldset>
<ul id="ContentPlaceHolder2_2g" class="profList column ui-sortable">
<legend class="group">المجموعه 2</legend><
li id="ContentPlaceHolder2_9">محمود فتحى ابراهيم عبد الصمد</li>
<li id="ContentPlaceHolder2_10">احمد محسن احمد على</li>
<li class="" style="" id="ContentPlaceHolder2_3">احمد درويش محمود عباس</li>
</ul></fieldset>




<fieldset>
<ul id="ContentPlaceHolder2_3g" class="profList column ui-sortable">
<legend class="group">المجموعه 3</legend>
<li id="ContentPlaceHolder2_11">محمد سيد محمد سيد</li>
</ul>

</fieldset>

i want to loop through it to get every ul tag and il inside it inedd the all elemet in ul tag and every ul tag in array