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  1. #!/bin/bash
  2. echo '192.168.1.1 foobar' | grep -E '([0-9]{1,3}\.?){4}' 
  3.  
Success #stdin #stdout 0s 19632KB
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stdin
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Standard input is empty
stdout
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192.168.1.1 foobar
https://ideone.com/LtiUhd
language:
Bash (bash 5.0.3)
created:
8 years ago
visibility:
secret

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