regex - Remove everything after a string in a data frame column with missing values -

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I have a data frame similar to the essence of the bottom: 

  Overview Identifier Value Objects ABC_2001 54 I would like to convert this data frame into a data frame, where the part after the string  "_" . The signature will be removed: As illustrated below:  
  Overview Identifier_Not Time Value ABC 54 Objacs2 ABC-2 Obback 3 1 Obscene 1 Obscene 1 Def  
 < P> I tried using  strsplit ,  gsub  and  sub  with discussion here but appreciated the work of those people I can not do this for the fact that: 
 
     
  1.  The values ​​in the column can not be c I want to leave them and where they are 
    2.  
  2.  The string "_" is located in different places 
    3.   
      
     
      
     
     text "> 
     You can try the  sub  command below to remove all non-space characters from the  _  symbol. 
     
      sub   
       
    •   _  matches a literal  _  symbol. / Li> 
    •   \ S *  matches zero or more non-space characters. 
      •  
     
      OR  
     
     all of these characters Micro  _  will remove the symbol, 
     
      sub ( "_.  
     
      Explanation:  
     
       
    •   _  one word Matches  _  symbol 
      •  
    •  . *  matches any character with zero or more times. 
      •

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