I've got a script with a variable taken from command line parameters. I want to check if it's value is one of dev, beta or prod. I've got following code snippet:

#!/usr/bin/env bash

ENV_NAME=$1

echo "env name = $ENV_NAME"
ENVIRONMENTS=('dev','beta','prod')
if [[ $ENVIRONMENTS =~ $ENV_NAME ]]; then
    echo 'correct'
    exit
else
    echo 'incorrect'
    exit
fi

When I run my script, it doesn't matter which parameters I pass: ./script.sh beta or ./script.sh or ./script.sh whatever, I always get correct echoed. What is wrong in my script?