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  1. import re
  2.  
  3. strings = [
  4.     "hello this is an example [ a    b c ]",
  5.     "hello this is another example [ cat    bird dog elephant   ]"
  6. ]
  7.  
  8. pattern = r"\[\s*([^][]*?)\s*]"
  9. for s in strings:
  10.     print(re.sub(pattern, lambda m: "[{0}]".format(re.sub(r"\s+", ',', m.group(1))), s))
Success #stdin #stdout 0.03s 9432KB
comments (?)
stdin 
Standard input is empty
stdout 
hello this is an example [a,b,c]
hello this is another example [cat,bird,dog,elephant]
https://ideone.com/9nDRsU
language:
Python 3 (python  3.9.5)
created:
1 year ago
visibility:
secret

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