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  1. import re
  2.  
  3. strings = [
  4. 	"",
  5. 	"b",
  6. 	"bb",
  7. 	"a",
  8. 	"bba",
  9. 	"bbbab",
  10. 	"bbbabb",
  11. 	"bbbbabbabb"
  12. ]
  13.  
  14. for s in strings:
  15. 	if re.match('^(b*((?<=bb)a(?=bb))?)+$', s):
  16. 	    print(f'"{s}" is a match')
  17.  
Success #stdin #stdout 0.02s 9576KB
comments (?)
stdin
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Standard input is empty
stdout
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"" is a match
"b" is a match
"bb" is a match
"bbbabb" is a match
"bbbbabbabb" is a match
https://ideone.com/JVc1Kt
language:
Python 3 nbc (python 3.7.3)
created:
6 years ago
visibility:
public

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