AUI Form Validation for Alpha and AlphaNumeric

<aui:input name="field1" >
           
    <!-- Only allow alphabetical characters -->
    <aui:validator name="alpha" />
   
</aui:input>

<aui:input name="field2" >
           
    <!-- Only allow alphanumeric characters/digits -->
    <aui:validator name="alphanum" />
   
</aui:input >