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  1. #!/bin/bash
  2. grep -oE  '[0-9]{,2}_' <<< "12_ 21"
  3. grep -oP  '[0-9]{,2}_' <<< "21_ 1{,2}_"
Success #stdin #stdout 0.01s 5316KB
comments (?)
stdin 
Standard input is empty
stdout 
12_
1{,2}_
https://ideone.com/75lsJ7
language:
Bash (bash 5.0.3)
created:
3 years ago
visibility:
secret

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