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  1. #!/bin/bash
  2. is_sign() {
  3. yoursign=$1
  4. re='^[+/*-]$'
  5. if ! [[ $yoursign =~ $re ]] ; then
  6.   echo "Not a sign"
  7.   #return 2
  8. else
  9.   echo "Yeah, is a sign"
  10.   #return 0
  11. fi
  12. }
  13.  
  14. echo "$(is_sign "+")"
  15. echo "$(is_sign "m")"
Success #stdin #stdout 0s 4524KB
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Standard input is empty
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Yeah, is a sign
Not a sign
https://ideone.com/aPY8FG
language:
Bash (bash 5.0.3)
created:
6 years ago
visibility:
secret

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