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  1. import re
  2. rx = r"field3:(.*?)(?=field\d+:|$)"
  3. s = "field1:afield3:b and morefield2:cfield3:d and here"
  4. res = re.findall(rx, s)
  5. print(res)
  6.  
Success #stdin #stdout 0s 23352KB
stdin
Standard input is empty
stdout
['b and more', 'd and here']