If textbox contain a specific string do some function - javascript -

i wondering how search specific string in big textbox (which contains 200 words) can make function color them. ex. in textbox there sentence "my dog happy" , want string "dog" become red button or sth else. possible???

yes, possible. don't use text box or text area, use div contenteditable = "true":

<div id="editablediv" class="editable" contenteditable="true">     sentence containing 'dog'.<br />     can edit contents of div. </div> <button id="highlightbtn">highlight "dog"</button> <script type="text/javascript">    highlightbtn.onclick = function() {          var elem = document.getelementbyid('editablediv');          elem.innerhtml = elem.innerhtml.replace(/dog/g,                              '<span class="redtext">dog</span>');    }  </script> 

and don't forget create classes redtext , editable in stylesheet:

.editable {     padding: 5px;     border: dashed 1px black; } .redtext {     color: red; } 

jsfiddle: http://jsfiddle.net/programfox/ummph/