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1255.Regular expression replace -- How to remove the first part of format A_B_A in each word?

User: Marvin -- 2014-09-29          << 1254  1256 >>
Hits: 1914
Type: Regular expression replace   
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Dear Staff of RP, 
   Sorry for asking another question. 
   How could I change "First_RB_first" into "RB_first"? 
Input Sample:
First_RB_first of_IN_of all_DT_all  
students_NNS_students can_MD_can only_RB_only 
Output Sample:
RB_first IN_of DT_all  
NNS_students MD_can RB_only 
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 'search for pattern' to: 
* set 'replace with pattern' to: 
3. click 'replace', done 
4. ctrl-s save to file. 
Note: if you just need to remove A_ from A_B_C, please use following formula in step 2: 

Screenshot 1:  Replace_Window

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