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  1. #!/bin/bash
  2. s="32432423 jkhkjh [234] hkjh32 2342342"
  3. grep -oP '\[\K[^][]*(?=])' <<< "$s"
Success #stdin #stdout 0s 4500KB
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stdin
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Standard input is empty
stdout
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234
https://ideone.com/G60Hvz
language:
Bash (bash 5.0.3)
created:
5 years ago
visibility:
secret

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