I was recently working on a website in Dreamweaver and had both PHP and CSS files with loads of blank lines of code, which needed to be deleted in order to make the files smaller.

So instead of doing it manually one at a time... which would have taken ages. I used a nice little tip in Dreamweaver.

1. Open the document you need to change.

2. Click CMD + F (Mac) or CTRL + F (PC).

3. In the Find and Replace window change the following:

Find in: to Current document

Search: to Source code

Find: input [\r\n]{2,}

Replace: input \n

Options: tick Use regular expression. It is slightly different in versions of cc 2016+ where you now need to choose the dropdown button on the top right - see the second picture below.

4. Finally select Replace All.

 CC 2015 and below

 CC 2016 and above

5. Optional - To make life easier just use the floppy disk icon to save the 'search and replace' settings for reference. Another tip: Make sure you also have 'current document' selected since it saves this setting as well.

Minor update for CC 2016+ the 'floppy disk save' is no longer available by default but can be activated by doing the following below options. IMPORTANT: You will need to edit this with another package other than Dreamweaver or you will keep loosing your changes.

 For Mac:

1. Quit Dreamweaver
2. Use finder to navigate to ~/Library/Preferences
3. Open 'Adobe Dreamweaver CC [YOUR_VERSION] Prefs' using a text editor
4. Find "[ADVANCED FIND AND REPLACE]" section and add "showhiddenoptions=TRUE"

[ADVANCED FIND AND REPLACE]
showhiddenoptions=TRUE

5. Save and close the file
6. Relaunch Dreamweaver

 For Windows:

1. Quit Dreamweaver
2. Open regedit
3. Navigate to 'HKEY_CURRENT_USER\Software\Adobe\Dreamweaver CC [YOUR_VERSION]\Advanced Find And Replace'
4. Add a string value "ShowHiddenOptions=TRUE"

ShowHiddenOptions=TRUE

5. Close regedit
6. Relaunch Dreamweaver

It should now appear again as below but with different icons for 'Save Query' and 'Load Query'.