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  1. #!/bin/bash
  2. s="Line
  3. Consider this line, and the word side one sideline
  4. and more here"
  5. grep -E '([[:alpha:]]{4})(.*\1){2}' <<< "$s"
Success #stdin #stdout 0s 19632KB
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Standard input is empty
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Consider this line, and the word side one sideline
https://ideone.com/auzREj
language:
Bash (bash 5.0.3)
created:
5 years ago
visibility:
secret

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