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  1. import re
  2. text = """ID        Information
  3.  
  4. 1         :20:Test1  :25:test2:28C:test3"""
  5.  
  6. valid_line_rx = r'^(\d+\s*)(:\d{2}[A-Za-z]?:.*)'
  7. print( re.sub(valid_line_rx, lambda m:
  8.   "\n".join(["{}{}".format(m.group(1),x) for x in re.split(r'(?!^)(?=:\d{2}[A-Za-z]?:)', m.group(2))]),
  9.   text, 
  10.   flags=re.M)
  11. )
Success #stdin #stdout 0.03s 9756KB
comments (?)
stdin 
Standard input is empty
stdout 
ID        Information

1         :20:Test1  
1         :25:test2
1         :28C:test3
https://ideone.com/t8ArdO
language:
Python 3 (python  3.12)
created:
5 years ago
visibility:
secret

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