How do I delete specific lines in Notepad++?

Question

I\'m cleaning up some code files (C#) and want to remove the regions. And I would like to delete all the lines that have the string \'#region\'. That\'s just an example, and

Answer 1

Investigate what is your EOL, \n or \r\n. Then replace .*#region.*\r\n with nothing in regexpr mode.