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  1. #!/bin/bash
  2. echo "hello 123 worLD" | grep -oP "\b(?=[A-Z]+[a-z]|[a-z]+[A-Z])[a-zA-Z]*"
Success #stdin #stdout 0s 5072KB
comments (?)
stdin 
Standard input is empty
stdout 
worLD
https://ideone.com/HjLH5o
language:
Bash (bash 5.0.3)
created:
7 years ago
visibility:
secret

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