04. Star Enigma regex

function solve(arr) {
    let n = arr.shift();//n – the number of messages
    arr = arr.slice(0, n);
    let attackedPlanets = [];
    let destroyedPlanets = [];

    arr.forEach(line => {

        let decryptionKey = line.match(/[s, t, a, r]/gi).length;
        line = line.split('').map(e => String.fromCharCode((e.charCodeAt(0) - decryptionKey))).join('');
        let pattern = /[^@!:>-]*@(?<planet>[A-Za-z]+)[^@!:>-]*:(?<population>[0-9]+)[^@!:>-]*!(?<attackType>[AD])![^@!:>-]*->(?<soldierCount>[0-9]+)/gm;
        let result = pattern.exec(line);
        if (result) {
            let attackType = result.groups.attackType;
            if (attackType === 'A') {
                attackedPlanets.push(result.groups.planet);
            } else if (attackType === 'D') {
                destroyedPlanets.push(result.groups.planet);
            }
        }

    });

    attackedPlanets.sort((a, b) => a.localeCompare(b));
    destroyedPlanets.sort((a, b) => a.localeCompare(b));

    console.log(`Attacked planets: ${attackedPlanets.length}`);
    if (attackedPlanets.length !== 0) {
        for (let planet of attackedPlanets) {
            console.log(`-> ${planet}`);
        }
    }
    console.log(`Destroyed planets: ${destroyedPlanets.length}`);
    if (destroyedPlanets.length !== 0) {
        for (let planet of destroyedPlanets) {
            console.log(`-> ${planet}`);
        }
    }
}