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Regular Expression In html List Tag Not Working In Multiline String In C#

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I have this string:
< li class="MsoNormal" style="color:white;mso-themecolor:background1; mso-margin-top-alt:mso-list:l1 level1 lfo1;tab-stops:list 36.0pt">
and the regex has a lazy quantifier to replace the string above to < li>. Using a simple regex pattern, it won't change the string above to ordinary < li>. The solution would be to add a regex to replace new line characters. Since the string has newline characters. 
Regex.Replace(source, @"\n", string.Empty, RegexOptions.IgnoreCase);

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