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  1. #!/bin/bash
  2. s='https://s...content-available-to-author-only...n.tld/[...]
  3. https://s...content-available-to-author-only...n.tld/test/[...]
  4. https://s...content-available-to-author-only...n.tld/[...]
  5. https://s...content-available-to-author-only...n.tld/files/[...]'
  6. grep -oP 'https?://\K[\w-]+(?=\.stage\.domain\.tld)' <<< "$s"
Success #stdin #stdout 0s 4436KB
comments (?)
stdin 
Standard input is empty
stdout 
subdomain1
subdomain2
https://ideone.com/HKAC8g
language:
Bash (bash 5.0.3)
created:
5 years ago
visibility:
secret

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