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  1. import re
  2.  
  3. arr = ['prefix a b c 123 c 123', 'prefix a b c d e 123 d e 123']
  4.  
  5. rx = re.compile(r'^prefix\s+(.*?)(.+?)\2+$')
  6.  
  7. for el in arr:
  8. 	r = re.sub(rx, r'\1', el)
  9. 	print (r)
  10.  
  11.  
Success #stdin #stdout 0.03s 9680KB
comments (?)
stdin 
Standard input is empty
stdout 
a b
a b c
https://ideone.com/4v79Av
language:
Python 3 (python  3.12)
created:
5 years ago
visibility:
public

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