Delete blank lines from a text file

Use the "Extended" setting in the Replace window (not "Regular expression": I'm sure there's a way to do it with Regular expression, but using "Extended" works fine).
Enter ".pPrev.\r\n" in the "Find what" field, and leave the "Replace what" field blank. This will include the \r\n characters in the match and delete the whole line.

I got a better answer. You could record a macro ( deleting for example 10 lines ) . Then run it several times .

1) Go to Macro > Start recording

2) hold Shift and tap Down to mark for example 10 lines . And delete them.

3) Go to Macro > Stop Recording

Now your macro is recorded, you can save it for using in the future .

4) Go to Macro > Save Current Recording Macro... . And save it with a name .

5) Move cursor to line that you want to delete lines after that.Then go to Macro > Run A Macro Multiple Times... . And select your macro and run it N times that you want.