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  1. #!/bin/bash
  2. regex='^(_[^_]*_)[^_]*(_.*\.txt)$'
  3. myvar='bar'
  4. result=$(sed -E "s/$regex/\1$myvar\2/")
  5.  
  6. echo $result # echo _12345_bar_678.txt
Success #stdin #stdout 0.01s 5528KB
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stdin
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_12345_23_678.txt
stdout
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_12345_bar_678.txt
https://ideone.com/s5T5Kl
language:
Bash (bash 5.0.3)
created:
2 years ago
visibility:
secret

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