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  1. #!/bin/bash
  2. s='23353_test.txt'
  3. grep -oP '(?<=_).*(?=\.)' <<< "$s"
  4. sed -n 's/.*_\(.*\)\..*/\1/p' <<< "$s"
Success #stdin #stdout 0.01s 5444KB
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stdin
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Standard input is empty
stdout
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test
test
https://ideone.com/JYTVlo
language:
Bash (bash 5.0.3)
created:
3 years ago
visibility:
secret

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