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  1. #!/bin/bash
  2. test="100 ***
  3. 10 ** // target"
  4. grep -E '(^|[^*])\*{2}($|[^*])' <<< "$test"
Success #stdin #stdout 0s 19632KB
comments (?)
stdin 
Standard input is empty
stdout 
10 ** // target
https://ideone.com/ozQwFc
language:
Bash (bash 5.0.3)
created:
6 years ago
visibility:
secret

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