http://www.pythonchallenge.com...Level3

 

import re

data_ = """_abaAAAbCCC"""

def main():
    p = re.compile ('[a-z]{1}[A-Z]{3}[a-z]{1}[A-Z]{3}[a-z]{1}')
    m = p.findall(data_)
   
    if m:
        print m
        for idx in m:
            print idx[4],
   
   
if __name__ == "__main__":
    main()