Thank you for the feature suggestion. We will consider adding such an option to the dialog internally.
Meanwhile, you can create and use your own FindReplaceDialog. RadRichTextBox uses MEF to load the dialogs, context menus and toolbars of its UI. In this regard, in order to replace a dialog, the only thing that needs to be done is to implement an interface and mark the custom dialog with the respective attribute. For starters, you can refer to this demo on Git Hub which shows how the default FindReplaceDialog can be used as a custom one.
When it comes to the search, RadDocument uses DocumentTextSearch, which allows searching in the document against regular expressions. You can read more in the documentation on Search. In a nutshell, in order to match the whole word only, you should add the regex-specific characters that match the boundaries of a word ("\b") before and after the string specified by the user:
+ textToSearch +
DocumentTextSearch search =
I hope this helps!
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