JavaScript Seleccione Atributo de opción
<select name="address" class="form-select" required onChange="getDistricts(this.options[this.selectedIndex].getAttribute('region_id'));">
<option value="">-----------</option>
@foreach($regions as $region)
<option value="{{ $region->name_ru }}" {{ old('address', '') == $region->name_ru ? 'selected' : '' }} region_id="{{ $region->id }}">{{ $region->name_ru }}</option>
@endforeach
</select>
<script>
function getDistricts(region_id) {
console.log(region_id);
}
</script>
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