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  1. import re
  2. import sys
  3.  
  4. file = sys.stdin
  5. text = file.read()
  6. main_domain = "happy.com"
  7. subdomains = re.findall(r"^(?:(.+)\.)?%s$" % re.escape(main_domain), text, re.M)
  8. print(subdomains)
Success #stdin #stdout 0.06s 9568KB
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stdin
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admin.happy.com
nothappy.com
happy.com
stdout
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['admin', '']
https://ideone.com/tTj7O2
language:
Python 3 (python  3.9.5)
created:
10 years ago
visibility:
secret

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