Regular Expressions Python Tutorial

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import re
s = '100 NORTH MAIN ROAD' 
s.replace('ROAD', 'RD.')                  
s = '100 NORTH BROAD ROAD' 
s.replace('ROAD', 'RD.')                       
s[:-4] + s[-4:].replace('ROAD', 'RD.')        
import re                                       
re.sub('ROAD$', 'RD.', s)