How do I delete empty lines in the code?

I often copy online code, but there is always a blank line in the Code. There is still no way to format the code using vs. What if I make the code more compact?

Answer: Use ultraedit. [I used this editor. It seems that editplus is not working. I don't know. You can try it.] Open the file and select the replace command in the search menu.
In the replace dialog box, select the regular expression check box and enter "% [^ t] + + ^ P" in "Find What". Note that there is a space before "^ t ].

The character meaning of this expression corresponds to editplus. Then, click Start or replace all to replace and delete empty rows.