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  1. s = "2015-12-292016-01-28"
  2. sub("\\B(\\d{4}-\\d{2}-\\d{2})", " \\1", s)
Success #stdin #stdout 0.48s 79168KB
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stdin 
Standard input is empty
stdout 
[1] "2015-12-29 2016-01-28"
https://ideone.com/OZyVwG
language:
R (R 3.5.2)
created:
8 years ago
visibility:
secret

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