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  1. #!/bin/bash
  2. s='Conclusion
  3. cold
  4. Collaccio'
  5. grep -i '\([[:alpha:]]\).*\1' <<< "$s"
  6. echo "---"
  7. grep -iP '^(?!.*(\p{L})(?:.*\1){2}).*(\p{L}).*\2' <<< "$s"
  8. echo "---"
  9. grep -i 'c.*c' <<< "$s"
  10. echo "---"
  11. grep -i '^[^c]*c[^c]*c[^c]*$' <<< "$s"
Success #stdin #stdout 0.01s 5372KB
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stdin
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Standard input is empty
stdout
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Conclusion
Collaccio
---
Conclusion
---
Conclusion
Collaccio
---
Conclusion
https://ideone.com/BKbgP2
language:
Bash (bash 5.0.3)
created:
3 years ago
visibility:
secret

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