import re
result = re.findall(r'AV', 'AV Analytics AV')
print (result)
#выводит  ['AV', 'AV']

  
>>> import re
>>> 
>>> lst = list(re.finditer(r'AV', 'AV Analytics AV'))
>>> lst
[<_sre.SRE_Match object at 0xb737c838>, <_sre.SRE_Match object at 0xb737c8a8>]
>>> 
>>> pos = [i.start() for i in lst]
>>> pos
[0, 13]
>>>

  
>>> import re
>>> 
>>> lst = [i.start() for i in re.finditer(r'AV', 'AV Analytics AV')]
>>> lst
[0, 13]
>>>