Need numbers going up on every blank line followed by a previous line break for subtitles
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 (Before) 00:03:26,487 --> 00:03:28,448 
 Do you mind the radio?00:03:29,198 --> 00:03:30,717 
 Do you want me to turn the radio off?00:19:07,990 --> 00:19:10,367 
 Okay. Be a good girl.
 Get out and go home.(After) 1 
 00:03:26,487 --> 00:03:28,448
 Do you mind the radio?2 
 00:03:29,198 --> 00:03:30,717
 Do you want me to turn the radio off?3 
 00:19:07,990 --> 00:19:10,367
 Okay. Be a good girl.
 Get out and go home.
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 search/replace doesn’t have a way of counting, so it’s more complicated than some questions. If you have the PythonScript plugin, you could write a script that would do it. However, if you are willing to do a multi-step process, what I might suggest is: - Search/Replace: FIND = \R(?!\d{2}:\d{2}:\d{2})REPLACE =☺SEARCH MODE = regular expression, REPLACE ALL => this will turn your data into00:03:26,487 --> 00:03:28,448☺Do you mind the radio?☺ 00:03:29,198 --> 00:03:30,717☺Do you want me to turn the radio off?☺ 00:19:07,990 --> 00:19:10,367☺Okay. Be a good girl.☺Get out and go home.☺ ...
- Insert a smiley at the beginning of each line: FIND = ^REPLACE =☺SEARCH MODE = regular expression, REPLACE ALL
- Use Column Select mode to select the zero-width first column.  The standard way of doing a column select is Alt+ Click-and-drag… but if your file is long (and I assume it is), you will want an alternate:this post describes a way to accomplish it:- Click in the upper-left corner of the modified document
- Edit > Begin/End Select
- Ctrl+Endto get to the end of the document
- Alt+leftClickto the left of the first character on the last line
- You should now have a column selection to the left of the first column of data:  
 
- ⦿ Edit > Column Editor
- Number to Insert
- Initial Number: 1
- Increase By: 1
 
- Convert the smilies back to newlines: FIND = ☺REPLACE =\r\nSEARCH MODE = regular expression, REPLACE ALL => 
 Hope this helps — 
 PS: If you find yourself often wanting to be able to do the begin/end selection in column mode, you can make a macro following instructions in this linked post
- Search/Replace: FIND = 
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 @PeterJones said in Need numbers going up on every blank line followed by a previous line break for subtitles: ⦿ Edit > Column Editor Number to Insert 
 Initial Number: 1
 Increase By: 1Convert the smilies back to newlines: FIND = ☺ REPLACE = \r\n SEARCH MODE = regular expression, REPLACE ALL => Awesome, thank you very much! worked like a charm except for step 3 part 2-4. 
 Scrolling down to the last line before the first character then holding Shift + Alt did the trick.
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 @Clayton-Lewis said in Need numbers going up on every blank line followed by a previous line break for subtitles: except for step 3 part 2-4. You are right. After 3.4, I should have said another Begin/End Selection. Sorry. But yes, what you described is equivalent.