openlayers 2 - OpenLayers2 - zoom to selected feature

If I have this vector layer:

var vectors = new OpenLayers.Layer.Vector("vector", {isBaseLayer: false});
var feature = new OpenLayers.Feature.Vector(
                OpenLayers.Geometry.fromWKT(
                    "POLYGON ((-18 -3, -18 14, 15 14, 15 -3, -18 -3))"
                )
            );
vectors.addFeatures([feature]);

How I can zoom to a selected feature of the layer by a single click event?