javascript - use variable in pattern -


i new jquery have simple html textarea , want count specific word in text area , show count , highlight text too.

$(document).ready(function() {               $(".text").on('input',function(){      var a=	$(".text").val();      //var a="i m running";       /*if(a==="nokia"){  	  	alert("nokia found");      }      else{  	alert("not found");      }*/       var pattern = /nokia/;      var pattern1 = /samsung/;      var pattern2 = /iphone/;      var pattern3 = /qmobile/;      //returns true or false...      var exists = pattern.test(a);      var exists1 = pattern1.test(a);      var exists2 = pattern2.test(a);      var exists3 = pattern3.test(a);      if(exists){      //true statement, whatever      //alert("nokia");      $(".nokia").css("background-color", "green");        }       else{         //false statement..do whatever       //alert("not nokia");         $(".nokia").css("background-color", "red");        }        if(exists1){         //true statement, whatever         //alert("samsung found");         $(".samsung").css("background-color", "green");       }      else{       //false statement..do whatever       // alert("not samsung found");        $(".samsung").css("background-color", "red");       }       if(exists2){       //true statement, whatever      //alert("samsung found");       $(".iphone").css("background-color", "green");      }       else{       //false statement..do whatever       //alert("not samsung found");        $(".iphone").css("background-color", "red");      }      if(exists3){       //true statement, whatever       // alert("samsung found");       $(".qmobile").css("background-color", "green");      }      else{       //false statement..do whatever      //alert("not samsung found");      $(".qmobile").css("background-color", "red");      }      });        counter = function() {        var value = $('#text').val();         if (value.length == 0) {          $('#wordcount').html(0);          $('#totalchars').html(0);          $('#charcount').html(0);          $('#charcountnospace').html(0);          return;       }        var regex = /\s+/gi;        var wordcount = value.trim().replace(regex, ' ').split(' ').length;      $('#wordcount').html(wordcount);       };       $(document).ready(function() {      $('#text').keydown(counter);      });      });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>  <textarea  id='text' style="width: 50%;height: 20%;"  type="text" class="text"/></textarea>  <button name="click" class="btn"/>click</button>  <div id="result">          words: <span id="wordcount">0</span><br/>  </div>  <ul>        <li class="nokia">nokia</li>  	<li class="samsung">samsung</li>  	<li class="iphone">iphone</li>  	<li class="qmobile">qmobile</li>  </ul>


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