In the CSharpTagger there is a StringPattern const defined. It represents the StringMatchingRegex pattern used to match strings in the documents which this tagger recognizes in the GetTags method. The SplitIntoWords method inheriting from the WordTaggerBase class is responsible for splitting the document into words. So if you want to achieve any parsing logic regarding the case insensitive text that is not currently available in RadSyntaxEditor, you have the possibility to do it.
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