You forgot to add required="" and aria-required="true" here is the full snippet:
<div class="row"> <form class="col s12"> <div class="row"> <div class="input-field col s12"> <input id="email2" type="email" class="validate" required="" aria-required="true"> <label for="email2" data-error="wrong" data-success="right">Email</label> </div> <div class="input-field col s12"> <input id="example" name="example" type="text" class="validate" required="" aria-required="true"> <label for="example" data-error="wrong" data-success="right">Field</label> </div> <div class="input-field col s12"> <button class="btn waves-effect waves-light" type="submit" name="action">Submit</button> </div> </div> </form> </div>
http://jsfiddle.net/u76rdq2h/
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