title: Replacing of string using javascript
body: <p>I want to replace string from "_tr9-9" character from a string and replace them with _id character</p>
  
  <p>Here str is changes only _tr9-0 will be changes dynamically remining will be same</p>
  
  <pre><code>str=Test_User_tr9-0;
  </code></pre>
  
  <p>Ex: </p>
  
  <pre><code>function (str)
  {
     var obj=str 
  }
  </code></pre>