objective c - iOS Regex: Unknown escape sequence "\|" -


I am getting a strange warning, and as a result my regex search is not working. Here's the line: 

  NSRang R = [HTML categoryoffstring: @ "\ | (*. *) \ |" Options: NSRegularExpressionSearch];   
 Where  html  is a string which I'm sure is a single match for regex above.  
 The warning only  
 
 
   
  You are getting a warning because  \ |  Objective-C (or C or C ++ for that matter) does not have a valid Escape sequence. The compiler is ignoring it and instead a raw  |  is using the character, so the string you are actually passing is  @ "| (. *)." .  
 You want to get the behavior, you have to run backslash in your source code so that the regex engine can see the literal backslash and  |  Alternately translate the character as a translation, such as  @ "\\ | (* * * \\ |" .

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