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  1. #!/bin/bash
  2. perl -pe 's/([a-z])(?!\1)(?i:\1)//g' <<< "foObar"
Success #stdin #stdout 0s 19632KB
comments (?)
stdin 
Standard input is empty
stdout 
fbar
https://ideone.com/dayqGo
language:
Bash (bash 5.0.3)
created:
6 years ago
visibility:
secret

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