If beginIndex and endIndex are equal, the newText is inserted immediately before the specified beginIndex

 

package{
  import flash.display.Sprite;
  import flash.text.*;
  public class Main extends Sprite{
    public function Main(){

        var t:TextField = new TextField(  );
        t.text = "mat";
        t.replaceText(2, 2, "s");
        trace(t.text);  // Displays: mast
        addChild(t);
    }
  }
}

Related examples in the same category

1.	Displaying Text
2.	Retrieving Strings from a TextField
3.	Special characters, such as \t for tab and \n for newline, can be used within a text string.
4.	You can append text by using the += operator or the appendText( ) method
5.	Append text to TextField
6.	Replaces the characters "bcd" in the text "abcde" with the new text "x"
7.	The url property allows you to add a hyperlink to text.
8.	The getLineIndexOfChar()/getLineLength()

If beginIndex and endIndex are equal, the newText is inserted immediately before the specified beginIndex : text « TextField « Flash / Flex / ActionScript

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