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  1. import re
  2. s = 'text @valid_username text @unvalid_username_ text @valid.username text @unvalid..username  @validusername.'
  3. print([x for x in re.findall(r'\B@[._a-z0-9]{3,24}', s) if x.count('.') < 2 and x.count('_') < 2 ])
Success #stdin #stdout 0.02s 27712KB
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Standard input is empty
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['@valid_username', '@valid.username', '@validusername.']
https://ideone.com/3woAII
language:
Python 3 (python  3.12)
created:
6 years ago
visibility:
secret

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