Validar formulário com bootstrap

<form id="formExemplo" data-toggle="validator" role="form">
  <div class="form-group has-feedback">
    <label for="textNome" class="control-label">Nome</label>
    <input id="textNome" class="form-control" placeholder="Nome do Motorista..." type="text"  data-error="Por favor, Digite nome do motorista. minimo 3 caracteres" data-minlength="3" required>
  	<span class="glyphicon form-control-feedback" aria-hidden="true"></span>
    <div class="help-block with-errors"></div>
  </div>
  
 
  
  <div class="form-group has-feedback">
    <label for="inputNumero" class="control-label">Prefixo Carro</label>
    <input type="number" class="form-control" id="inputNumero" placeholder="Digite Prefixo..."  
      data-minlength="1" data-maxlength="6" required>
      <span class="glyphicon form-control-feedback" aria-hidden="true"></span>
    <span class="help-block">1234</span>
  </div>
  <div class="form-group has-feedback">
    <label for="inputNumero" class="control-label">Placa Carro</label>
    <input type="text" class="form-control" id="inputNumero" placeholder="Placa do Carro..."  
      data-minlength="6" required>
      <span class="glyphicon form-control-feedback" aria-hidden="true"></span>
    <span class="help-block">AAA-1234</span>
  </div>
  
  
  
  <div class="form-group">
    <button type="submit" class="btn btn-primary">Enviar</button>
  </div>
</form>