Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

During development of a Bash deployment script you encounter the following validation function:

validate() {
    local re='^[A-Z]{3}-[0-9]{4}$'
    if [[ "$1" =~ "$re" ]]; then
        echo 'valid'
    else
        echo 'invalid'
    fi
}

Running validate CPU-1234 prints invalid, even though the string looks correct.

Which minimal change will make the test succeed without altering the regular expression?

  • Reverse the operands so the test becomes [[ $re =~ "$1" ]].

  • Replace =~ with == to perform a glob comparison instead of a regex match.

  • Enable extended pattern matching with shopt -s extglob before calling the function.

  • Remove the double quotes around the pattern expansion so the test reads [[ "$1" =~ $re ]].

CompTIA Linux+ XK0-006 (V8)
Automation, Orchestration, and Scripting
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