javascript - How to guess username using email id? -


in registration form taking email id.i want show 3-5 username suggestions using email id.suggestions should relavant email id.

code

var generaterandomusernames = function (email) {         var array = [];         var possible = email.split('@')[0];         console.log('===========', possible);         for( var i=0; < 5; i++ )              array[i] = possible.substring(0,(math.floor(math.random() * possible.length) + 1  ));  }

note: email may contain period(.), underscore(_) etc special characters.

could please suggest me how handle special characters contained email?

here example of autocomplete username using email. can modify per requirement.

<!doctype html> <html lang="en"> <head>   <meta charset="utf-8">   <title>auto-complete username using email</title>  <link rel="stylesheet" href="http://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">  <script src="http://code.jquery.com/jquery-1.10.2.js"></script>  <script src="http://code.jquery.com/ui/1.11.4/jquery-ui.js"></script>  <link rel="stylesheet" href="/resources/demos/style.css"> <script>  $(function() {  var emailval = $('input:text[name=email]').val();  var suggestion = emailval.split("@")[0];  var suggestion2=emailval.split(".")[0];  var availabletags = [  suggestion,  suggestion2  ];  $( "#tags" ).autocomplete({   source: availabletags  }); }); </script> </head> <body>  <input type="text"  name="email" value="musakkhir.sayyed@gmail.com" />  <div class="ui-widget">  <label for="tags">tags: </label>  <input id="tags">  </div>   </body> </html>

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