title: Regex to check if string only contain digits and is 11 characters/digits long?
body: <p>currently I am using:</p>
  
  <pre><code>if (Regex.IsMatch(searchValue, @"^\d{11}.*") &amp;&amp; searchValue.Length == 11)
     {
       // Do something
     }
  </code></pre>
  
  <p>How can I alter the regex to also check the length and not to use the &amp;&amp; operator?</p>
  
  <p>Thanks in advance.</p>