nodepad++ delete a line with special characters through regular expressions

 

 I accidentally generated the sln file of the x64 platform in the VS project. I want to delete the x64 in the sln file. There are more than 500 lines in the search. What should I do? It is too laborious to delete one by one.

 

  Replace by regular expression of nodepad++:  

     I want to delete the one with X64, then write ^.*x64.*\r?\n in the replacement place and replace it with empty.