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					Originally Posted by  phossler
					 
				 
				I didn't know that either. Is it in the manual? 
 
Possibly when a user is in [Normal] search mode and enters a backslash or other escape-able character, Calibre could change the search and replace  terms internally to be compatible with he internal RE engine? 
 
Not knowing the 'trick' could lead to a lot of head scratching 
			
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 It already does for search strings, just not for replace strings, because it is pretty rare, basically only \<digit> and a couple of other forms are special.