python - Replacing strings in its entirity -

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I want to change the words if it completely matches the string in Python.

Suppose, 

  st = 'lengthy take'   
 I take all the words with the word "LE" & lt; =  
 Want to make the result  
  'Length & lt; = '  
 I tried to change it () and at re.sub () I want it  
 ' & lt; = Ngth & lt; = '  
 Is there an inbuilt function for this operation?   
 
 
 Try something like this ...    Import This regular expression is  \ bLe \ b  / Code> and  & lt; =  with all the matches. Expression means  "le" where it is not surrounded by alphanumeric characters . Basically, where  Le  is surrounded by white space or punctuation marks.  
 The Python is readable on the document, especially look at the  \ b  which matches the one word boundary.

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