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  1. import re
  2. def first_non_repeat(string):
  3. 	r = re.compile(r'([a-z])(?=.*\1)', re.I|re.S)
  4. 	m = r.search(string)
  5. 	while m:
  6. 		string = re.sub(m.group(1), '', string, re.I)
  7. 	 	m = r.search(string)
  8. 	return string[0]
  9.  
  10. print(first_non_repeat('sTreSS'))
Success #stdin #stdout 0s 9024KB
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https://ideone.com/l5Stt1
language:
Python (cpython 2.7.16)
created:
9 years ago
visibility:
secret

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