As an example, the query //books[contains(@title,"Matilda")] should only return the book titled "Matilda" but instead returns all books, when executed with INCLUDE_ALL_DESCENDANTS option, i.e. it returns the same data as //books.

This is because a query containing only a contains condition incorrectly invokes getDataNodesUsingRegexQuickFind, due to the canUseRegexQuickfind method not checking for contains condition.