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  1. import re
  2.  
  3. def count_overlapping(string, pattern):
  4.     regex = '{}(?={})'.format(re.escape(pattern[:1]), re.escape(pattern[1:]))
  5.     it = re.finditer(regex, string)
  6.     # Consume iterator, get count with minimal memory usage
  7.     return sum(1 for _ in it)
  8.  
  9. mystr = '^_^_^-_-'
  10. print(count_overlapping(mystr, '^_^'))
  11. print(count_overlapping(mystr, '-_-'))
  12. print(count_overlapping(mystr, ''))
  13. print(count_overlapping(mystr, 'x'))
Success #stdin #stdout 0.04s 9588KB
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https://ideone.com/vLih7t
language:
Python 3 (python  3.9.5)
created:
6 years ago
visibility:
public

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