Dup4

if [[ " ${array[@]} " =~ " ${value} " ]]; then
    # whatever you want to do when arr contains value
fi
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if [[ ! " ${array[@]} " =~ " ${value} " ]]; then
    # whatever you want to do when arr doesn't contain value
fi
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if [[ " ${!array[@]} " =~ " ${value} " ]]; then
    # whatever you want to do when arr contains value