Remove newlines from a string using regex

Question

Having a regex:

 ((?![lL][aA][bB][eE][lL][sS]?\\s?:|[lL][aA][bB][eE][lL][sS]?\\s?-|[lL][aA][bB][eE][lL][sS]?\\s?\\||\\|\\s?[lL][aA][bB][eE][lL][sS]?).)*