regex - Python - Modifying a backreference. Can it be done? -

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New in Python, so please forgive my ignorance. I am trying to modify the strings referenced back in a regular expression.

Example: 

  & gt; & Gt; & Gt; A_string 'fsa fad fdsa dsafasdf u.s.a. U.S.A. U.s.a fdas adfs.f fdsa f.afda '& gt; & Gt; & Gt; Re.sub (r '? (. & Lt;.? = \ S) (([a-zA-Z] \) + [a-zA-Z] \ {0,1}) (= \ s) , '& Lt; acronym & gt;' + re.sub (r '\.,' R '', ('r' ''). Upper ()) '' , a_string ) 'Fsa fad fdsa dsafasdf & lt; Acronyms & gt; USA & lt; / Acronyms & gt; & Lt; Acronyms & gt; United States & lt; / Acronyms & gt; & Lt; Acronyms & gt; U.s.a & lt; / Acronyms & gt; Fdas adfs.f fdsa f.afda '  
 Instead, I think the desire for output is:  
 ' fsa fadsa dsafasdf & lt; Acronym & gt; USA & lt; / Acronym & gt; & Lt; Acronyms & gt; United States & lt; / Acronyms & gt; & Lt; Acronyms & gt; United States & lt; / Acronyms & gt; thanks for your help.   
 
   
> 
 from:  
 
 If  repl  is a function, it is called for each non-overlapping event of  pattern  function takes a single match object argument, and the replacement Returns the string. For example:   
 See examples in the link and Docs.

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