Select closest word to cursor in textarea (like ctrl+D in sublime text)

gistfile1.js

var textarea = textarea

// detect dots and comas
function trimtrim (truc) {
  truc = $.trim(truc)
  truc = truc.replace(/\./, "");
  truc = truc.replace(/\,/, "");
  truc = truc.replace(/\;/, "");
  return truc
}

// select closest word
function selectClosestWord(){
  // selection
  var start = textarea.prop("selectionStart")
  var end = textarea.prop("selectionEnd")

  // is any word highlighted?
  if(start == end){

    var textarea_text = textarea.val()
    var word = ""

    // left side
    if(start != 0){
      while(trimtrim(word) == word){
          start = start - 1
          word = textarea_text.substr(start, end - start);
          if(start == 0)
              break
      }
      if(start != 0)
        start++
      word = trimtrim(word)
    }

    // right side
    if(end < textarea_text.length){
      while(trimtrim(word) == word){
          end = end + 1
         console.log(end)
          word = textarea_text.substr(start, end - start);
          if(end > textarea_text.length)
              break
      }
      if(end <= textarea_text.length)
        end--;
      word = trimtrim(word)
    }
    
    textarea.prop('selectionStart', start)
    textarea.prop('selectionEnd', end)
    textarea.focus()
    
    return word
  }
}


// CTRL + D
$(document).bind('keydown', function(e) {
  if(e.ctrlKey && (e.which == 68)) {
    e.preventDefault()

    selectClosestWord()

    return false
  }
});