title: regular expression for length 6 to 20 characters with upper and lower case alphabets and numeric character support
body: <p>this regex is used to test the password that support at least one lower case and upper case alphabets and numbers. this regex is not support 6 to 20 characters support.</p>
  
  <pre><code>/(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,}/
  
  /*
   var result = /(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,}/;
   return result.test(value);
  */  
  </code></pre>