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  1. {
  2. printf("%s%s",$0~/^\[ [0-9]{4}\/[0-9]{2}\/[0-9]{2}/?(FNR!=1?ORS:""):OFS,$0)
  3. }
Success #stdin #stdout 0s 4716KB
comments (?)
stdin 
[ 2020/08/12 11:40] Success with "one line [42]"
[ 2020/08/12 11:40] Success with "two
lines [13]"
[ 2020/08/12 11:40] Success with "two lines with a twist
[19] to confuse you"
[ 2020/08/12 11:41] Failure with "one line again"
stdout 
[ 2020/08/12 11:40] Success with "one line [42]"
[ 2020/08/12 11:40] Success with "two lines [13]"
[ 2020/08/12 11:40] Success with "two lines with a twist [19] to confuse you"
[ 2020/08/12 11:41] Failure with "one line again"
https://ideone.com/PXVCh2
language:
AWK (gawk 4.2.1)
created:
5 years ago
visibility:
secret

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