# 0908.py

import re

testo='fine 65 345 era 900 - 111'
ris=re.search('(\d+) +(\d+).*?(\d+)',testo)
if ris:
  for i in range(4): print (ris.group(i))
# 65 345 era 900
# 65
# 345
# 900

print (ris.groups())
# ('65', '345', '900')

#######################################

testo='fine a65 345 era 900'
ris=re.search('(yy)|a(\d+) +(\d+).*?(\d+)',testo)

print (ris.groups(default='--'))
# ('--', '65', '345', '900')

#######################################

testo='era 56 83567  1560'
ris=re.search(r'(\d+).*\1.*(\1)',testo)
if ris: print (ris.groups())
# ('56', '56')