How to extract using regex

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text is a XML with Namespaces. Therefore we recommend to work with XML oriented options instead of with Regex. Handling XML Namspaces have a look here:
XML Extraction - Handling Namespaces (Tableau, Soap, OASIS types) - Help / Community - UiPath Community Forum

UPD1 - Additional Suggestion:
as the XML also looks like a XAML maybe you can elaborate more on the overall goal