Finding and replacing blank lines regex in Notepad++ [duplicate]

Question

I'm using Notepad++ and basically I want to find all blank lines that don't contain text using Notepad++ regex. I know that there is a simpler way of doing this by using 'textfx,' but I'm looking for an expression to do this. Here is an example below with the symbols shown.

< ?php **CRLF**
**CRLF**                        *<- REMOVE THIS* 
$xxx = $_POST['xxx'];**CRLF**
$xxx = $_POST['xxx'];**CRLF**
$xxx = $_POST['xxx'];**CRLF**
**CRLF**                        *<- REMOVE THIS* 
**CRLF**                        *<- REMOVE THIS* 
if ($xxx)**CRLF**
{**CRLF**

Answer 1

I just did find ^\r\n and replace with nothing

Answer 2

Not a regular expression, but Notepad++ 6.3.2 has a number of ways of removing blank lines without using a regular expression.

Menu => Edit => Line operations => Remove empty lines

Menu => Edit => Line operations => Remove empty lines (containing blank characters)

Menu => TextFx => TextFx Edit => Delete blank lines

Menu => TextFx => TextFx Edit => Delete surplus blank lines

The two TextFx methods only delete empty lines, but they can be preceded with either of:

Menu => Edit => Blank operations => Trim trailing spaces

Menu => TextFx => vTextFx Edit** => Trim trailing spaces