WebCompDev / COMPONENTS

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<link rel="import" href="../../polymer/polymer.html">
<link rel="import" href="../../iron-validator-behavior/iron-validator-behavior.html">

<script>

  Polymer({

    is: 'letters-only',

    behaviors: [
      Polymer.IronValidatorBehavior
    ],

    validate: function(value) {
      return !value || value.match(/^[a-zA-Z]*$/) !== null;
    }

  });

</script>