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  1. #!/bin/bash
  2. s='A:AAAA:AA: :A:0123456789ABC   :AAA:AAA       :          :AA:          :     :'
  3. sed 's/^\(.\{14\}\)\([[:alnum:]]\{13\}\)[[:space:]]*:/\1000\2:/' <<< "$s"
Success #stdin #stdout 0.01s 5512KB
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Standard input is empty
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A:AAAA:AA: :A:0000123456789ABC:AAA:AAA       :          :AA:          :     :
https://ideone.com/OGAd6L
language:
Bash (bash 5.0.3)
created:
3 years ago
visibility:
secret

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