Remove empty lines in Netbeans 7.x , NotePad++ &.. with Regular Expression

You can do this with a regular expression + and a replacement. Do this in an editor window or in the project (or files) directory tree:

• Ctrl + H
• Check “Regular Expression”
• Search for nn
• Replace with n
• Click “Replace all” until all lines are deleted

If you want to keep a blank line you should:

• Search for nnn
• Replace with nn

If you want to replace consecutive lines that are not empty but contain whitespaces only you should:

• Search for n[tr]+$n
• Replace with n