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166.Advanced search and replace -- How to join groups of lines together in a text file according to user defined rule?

User: editor -- 2008-05-30          << 165  167 >>
Hits: 3387
Type: Advanced search and replace   
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Description:
How to join groups of lines together in a text file according to user defined  rule?
Input Sample:
[item1] 
line1 
line2 
line3 
[item2] 
line21 
line22 
 
[item3] 
line31 
line32 
line33
Output Sample:
[item1] line1 line2 line3 
[item2] line21 line22  
[item3] line31 line32 line33
Answer:
Hint: You need to Download and install "Replace Pioneer" on windows platform to finish following steps.
It's easy to use replace pioneer, just need to remove the line break which is not followed by a '['. 
1. ctrl-o open source file.     
2. ctrl-h open 'Replace' dialog,     
in 'Replace' window,      
* fill in 'Search for Pattern':     
 
Note: \n+ means any of consecutive line breaks 
* fill one space character in 'Replace with Pattern': 
 
* fill the window under 'If': 
 
Note: means the matched \n+ not followed by a '[' 
3. click 'Replace', finish. 
 
Above operation means if a line is not followed by a '[' in next line, replace the line break with one space character.
Download Script:  scripts/166.rst.zip

Screenshot 1:  Replace_Window


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Check Demo of Advanced search and replace
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