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1063.Text file parser -- How to extract interface of paragraph without "sw ac" or "sw tr"?

User: sam -- 2013-03-08          << 1062  1064 >>
Hits: 1377
Type: Text file parser   
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How to find out without "sw ac" or "sw tr" Interface
Input Sample:
interface A
sw ac
interface B  
interface C
sw tr
sw ac
interface D
sw tr
Output Sample:
interface B  
Hint: You need to Download and install "Replace Pioneer" on windows platform to finish following steps.
1. ctrl-o open text file
2. ctrl-h open 'replace' dialogue
* set 'replace unit' to 'Paragraph'
* set 'replace with pattern' to:

* uncheck option of 'print unmatched unit'
* set 'if =>' to:

* click 'settings' tab:
set 'Para start' to 'other': 
set 'Para end' to 'none'
3. click 'replace', done.

Screenshot 1:  Replace_Window

Screenshot 2:  Replace_Settings_Window

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