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let contains = false;

const array = ['imprint', 'data-protection', 'terms-of-use'];

const currentUrl = '/imprint'.toUpperCase();
// mit window.location.href ersetzen

array.forEach(function (item) {
    let currentItem = item.toUpperCase();

    if (currentUrl.includes(currentItem)) {
        contains = true;
    }
});

console.log(contains);