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import re
import sys
 
for line in sys.stdin:
  if not re.match(r'(?:\S|(?<!\s)  (?!\s))*$', line):
     print(repr(line)) # failed

Success #stdin #stdout 0.02s 5808KB

stdin

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1
1  2  3
single space
triple   space
four    spaces
trailing.  space 
  1
1  
  1.  2.

stdout

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'single space\n'
'triple   space\n'
'four    spaces\n'
'trailing.  space \n'
'1  \n'
'  1.  2.  \n'

https://ideone.com/ST1Lm

language:

Python 3 (python 3.12)

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