regex - Remove empty lines in text using Visual Studio

Question

How to remove empty lines in Visual Studio?

Answer 1

Since Visual Studio 2012 changed its regex syntax, the original answers by Ala translate into the following in VS 2012:

Remove single blank lines

Old:

^:b*$

New:

^(?([^
])s)*
?$
?

Visual Studio 2013 (thanks to BozoJoe and Joe Johnston):

^s*$

Remove double blank lines

Old:

^:b*
:b*

New:

^(?([^
])s)*
?
(?([^
])s)*
?

Rolls right off your tongue.

Here is the conversion sheet from MSDN.