How can I highlight a subset of the text in an input box?

I'm trying to figure out if it's possible using Javascript to highlight a specific range of data in a text field.

textfield.select();

That ^^ works to select the entire text, but for all my googling I haven't stumbled upon a way to select, for example, characters 2 through 10 of the entered text. Is this possible?

Thanks!

From stackoverflow

• I think there is a very IE-specific way to do it that involves TextRange objects.

  Here's some documentation on the TextRange object.

  After posting I realized that this might only work on a textarea.

• This is handled differently with IE vs everyone else.

  Here is a reference guide with examples:

  http://www.sxlist.com/techref/language/html/ib/Scripting_Reference/trange.htm

• This object will let you get, set & modify the selected region of a text box.

  function SelectedText(input) {
    // Replace the currently selected text with the given value.
    this.replace = function(text) {
      var selection = this.get();
  
      var pre = input.value.substring(0, selection.start);
      var post = input.value.substring(selection.end, input.value.length);
  
      input.value = pre + text + post;
  
      this.set(selection.start, selection.start + text.length);
  
      return this;
    }
  
    // Set the current selection to the given start and end points.
    this.set = function(start, end) {
      if (input.setSelectionRange) {
        // Mozilla
        input.focus();
        input.setSelectionRange(start, end);
      } else if (input.createTextRange) {
        // IE
        var range = input.createTextRange();
        range.collapse(true);
        range.moveEnd('character', end);
        range.moveStart('character', start);
        range.select();
      }
  
      return this;
    }
  
    // Get the currently selected region.
    this.get = function() {
      var result = new Object();
  
      result.start = 0;
      result.end = 0;
      result.text = '';
  
      if (input.selectionStart != undefined) {
        // Mozilla
        result.start = input.selectionStart;
        result.end = input.selectionEnd;
      } else {
        // IE
        var bookmark = document.selection.createRange().getBookmark()
        var selection = inputBox.createTextRange()
        selection.moveToBookmark(bookmark)
  
        var before = inputBox.createTextRange()
        before.collapse(true)
        before.setEndPoint("EndToStart", selection)
  
        result.start = before.text.length;
        result.end = before.text.length + selection.text.length;
      }
  
      result.text = input.value.substring(result.start, result.end);
  
      return result;
    }
  }