title: Regular expression for @ after space in text area
body: <p>Write a regular expression for @ in some text, but @ must be after space only...
  Please help me...
  In this case am using <a href="http://ichord.github.io/At.js/" rel="nofollow noreferrer">AT JS</a>
  Actually am problem is i need to make ajax call after @,followed by space as in the following scenario <a href="https://i.stack.imgur.com/vbc13.png" rel="nofollow noreferrer">Screenshot of my problem</a></p>
  
  <pre><code>jQuery(document).ready(function(){
  jQuery('#editable').bind("keyup", function(event){
      jQuery.ajax({
          url: base_url + 'index.php/tags',
          type: "GET",
          dataType: "json",
          success: function(result)
          {
              jQuery('#editable').atwho({
                  at: "@",
                  data: result,
                  limit: 50,
                  minLen:1,
                  callback: {
                      filter: function (query, data, search_key) {
                          return jQuery.map(data, function(item, i) {
                              return item[search_key].toLowerCase().indexOf(query) &lt; 0 ? null : item
                          })
                      }
  
                  }
              });
          },
      });
  });
  </code></pre>
  
  <p>});  </p>