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import re
 
regex = r"(?<![a-z])(?=([a-z]+_[a-z]+))"     
test_str = "ash_tonic_transit_so_kern_err_looo_"     
print(re.findall(regex, test_str))

Success #stdin #stdout 0.02s 9384KB

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Standard input is empty

stdout

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['ash_tonic', 'tonic_transit', 'transit_so', 'so_kern', 'kern_err', 'err_looo']

https://ideone.com/nagKfd

language:

Python 3 (python 3.9.5)

created:

visibility:

public

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