"\n Represents a line break that was inserted with the Shift+Enter key combination. To change a line break into a paragraph break, enter \n in the Search for and Replace with boxes, and then perform a search and replace.
\n in the Search for text box stands for a line break that was inserted with the Shift+Enter key combination.
\n in the Replace with text box stands for a paragraph break that can be entered with the Enter or Return key.
\t Represents a tab. You can also use this expression in the Replace with box.
\b Match a word boundary. For example, "\bbook" finds "bookmark" but not "checkbook" whereas "book\b" finds "checkbook" but not "bookmark". The discrete word "book" is found by both search terms.
^$ Finds an empty paragraph."