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+<!--
+@license
+Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+
+<link rel="import" href="../../polymer/polymer.html">
+<link rel="import" href="../../iron-validator-behavior/iron-validator-behavior.html">
+
+<script>
+  Polymer({
+    is: 'ssn-validator',
+
+    behaviors: [
+      Polymer.IronValidatorBehavior
+    ],
+
+    validate: function(value) {
+      // this regex validates incomplete ssn's (by design)
+      return !value || value.match(/^[0-9]{0,3}-[0-9]{0,2}-[0-9]{0,4}$/);
+    }
+  });
+</script>