title: Getting "Regular expression is invalid: missing )" error using json in MongoDb
body: <p>I am running the query given below.</p>
  
  <pre><code>db.CollectionName.find({'serviceName':{'$regex':'^(ALBUMIN$','$options':'si'}})
  </code></pre>
  
  <p>I am getting the following error.</p>
  
  <pre><code>Error: error: {
      "ok" : 0,
      "errmsg" : "Regular expression is invalid: missing )",
      "code" : 2,
      "codeName" : "BadValue"
  }
  </code></pre>
  
  <p>How can I avoid this error since bracket can be anywhere inside the string?
  Like- (ALBUMIN  or ((ALBUMIN) etc.</p>