title: Regex for allowing particular Special Characters
body: <p>I need a regex for allowing list of special characters((_-.$@?,:'/!) and letters supporting utf-8 languages.</p>
  
  <p>I tried </p>
  
  <pre><code>/^[\_\-\.\$@\?\,\:\'\/\!]*$/
  </code></pre>
  
  <p>but typing letters in English and Tamil shows invalid.</p>