title: Replace string with double quotes + string using regex
body: <p>I want to replace a string with <strong>(double quotes + string)</strong>. Need to use it into python.</p>
  
  <p><strong>Input</strong> : <code>{responseHeader:{status:0,QTime:94}}</code></p>
  
  <p><strong>Output</strong> : <code>{"responseHeader":{"status":0,"QTime":94}}</code></p>
  
  <p>Tried <code>/[^\d\W]+/g</code> <strong>regex</strong> to get <strong>only string</strong> but don't know how to <strong>replace</strong> it with <strong>(double quotes + string)</strong>.</p>