Flash / Flex / ActionScript/String/substr

Optionally omit the second parameter, substr returns a substring starting at the specified index and going to the end of the original string.

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var sTitle:String = new String("ActionScript Bible");
       trace(sTitle.substr(6));  // Displays: Script Bible
   }
 }

}

       </source>
   
  

Specifying a negative value simply counts backward from the end of the string where -1 is the last character.

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var sTitle:String = new String("ActionScript AAAAA");
       trace(sTitle.substr(-12, 6));  // Displays: Script
   }
 }

}

       </source>
   
  

substring method returns a substring starting with the starting index specified and containing all the characters up to, but not including, the ending index.

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var sTitle:String = new String("ActionScript");
       trace(sTitle.substring(6, 12));  // Displays: Script
   }
 }

}

       </source>
   
  

Use lastIndexOf to get the file name without extension name

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var filename:String = "document.jpg";
       var extensionIndex:Number = filename.lastIndexOf( "." );
       
       var extensionless:String = filename.substr( 0, extensionIndex ); 
       trace( "The filename is " + extensionless );

   }
 }

}

       </source>
   
  

Working with Substring Values: substr

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var sTitle:String = new String("ActionScript Bible");
       trace(sTitle.substr(6, 6));  // Displays: Script
       trace(sTitle.substr(0, 6));  // Displays: Action
       trace(sTitle.substr(0, 12)); // Displays: ActionScript
   }
 }

}

       </source>