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  1. import re
  2.  
  3. s=['123456abc','abcisjgm','1234567895','1231231231']
  4.  
  5. for i in s:
  6.     if re.search(r'^(?=\d*?4)\d{10}$', i):
  7.         print(i, "is valid")
  8.     else:
  9.         print(i, "is not valid")
Success #stdin #stdout 0.02s 9500KB
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stdin
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Standard input is empty
stdout
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123456abc is not valid
abcisjgm is not valid
1234567895 is valid
1231231231 is not valid
https://ideone.com/3GiE45
language:
Python 3 (python  3.9.5)
created:
4 years ago
visibility:
secret

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