You can get the unformatted text in the RichTextBox using this approach
RichTextBox rtb = richTextBox as RichTextBox;
TextRange tr = new TextRange(rtb.Document.ContentStart, rtb.Document.ContentEnd);
Home / FAQ / WPF / RichTextBox / How to get the RichTextBox’s unformatted text?
You can get the unformatted text in the RichTextBox using this approach
RichTextBox rtb = richTextBox as RichTextBox;
TextRange tr = new TextRange(rtb.Document.ContentStart, rtb.Document.ContentEnd);
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