title: Symfony Validator Constraints Assert Regex
body: <p>I have an entity for which I use <code>Regex</code> and <code>NotBlank</code> to validate. I need this field to contain only English letters, without numbers. Everything works fine, but when I post Cyrillic I don't get an error. Why is that? I need only English </p>
  
  <pre><code>/**
   * @var string
   *
   * @Assert\NotBlank()
   * @Assert\Regex(
   *           pattern= "/^\w+/",
   *           match=   false,
   *           message= "This text cannot contain numbers"
   * )
   *
  </code></pre>