[рони]

Hovik,

<script>
let res = `Paris, France
Marseille, France
Cagnes-sur-Mer, France
Vũng Tàu, Ba Ria - Vung Tau, Vietnam итл.`
var regexp = res.match(/^[^,]+/mig);
document.write(regexp.join('<br>'))
  </script>