Remove unnecessary space between lines (regular expression)

Reference: http://forums.digitalpoint.com/showthread.php?t=622323

Easier:

1. Open the file
2. Click CTRL + F
3. Select "Current document" in "Find in" (You can also select the folder if you have multiple files)
4. Search in "Source code"
5. Tick "Use regular expression"
6. Type "[\r\n]{2,}" (without quotes) in "Find"
7. Type "\n" (without quotes) in "Replace"
8. Press "Replace All"