Parsing a file name and printing a portion to an image

Question

Ive got a script writen for me that reads the file name of the image, creates a new layer , prints it ti the bottom of the image. I was wondering if anyone knew if there is a way to parse only a portion of the file name out and print that to the screen. Below is the relevant part f the code (I think) that selects the text to be printed on the new layer
var myLayerRef = docRef.artLayers.add();
        myLayerRef.kind = LayerKind.TEXT;
        myLayerRef.name = "Filename";
        var myTextRef = myLayerRef.textItem;
if the file name of the image is ;  30090416 0056 , I want to use only the 0056 portion, as the code is written above the whole file name save the extension is written to the image.
Thoughts?????

Answer 1

That didnt seem to work, the same full filename (minus the extension) still prints.  Here is more of the script. I tried to attach the whole thing but it wouldnt upload.
var originalRulerUnits = preferences.rulerUnits;
preferences.rulerUnits = Units.PERCENT;
try
var docRef = activeDocument;
// Create a text layer at the front
var myLayerRef = docRef.artLayers.add();
myLayerRef.kind = LayerKind.TEXT;
myLayerRef.name = "Filename";
var myTextRef = myLayerRef.textItem;
//Set your parameters below this line
//If you wish to show the file extension, change the n to y in the line below, if not use n.
var ShowExtension = "n";
// Insert any text to appear before the filename, such as your name and copyright info between the quotes.
//If you do not want extra text, delete between the quotes (but leave the quotes in).
var TextBefore = "";
// Insert any text to appear after the filename between the quotes.
//If you do not want extra text, delete between the quotes (but leave the quotes in).
var TextAfter = "";
// Set font size in Points
myTextRef.size = 24;
//Set font - use GetFontName.js to get exact name
//myTextRef.font = "TimesNewRomanPSMT";
myTextRef.font = "Arial";
//Set text colour in RGB values
var newColor = new SolidColor();
newColor.rgb.red = 255;
newColor.rgb.green = 255;
newColor.rgb.blue = 255;
myTextRef.color = newColor;
// Set the position of the text - percentages from left first, then from top.
myTextRef.position = new Array( 2 , 99);
// Set the Blend Mode of the Text Layer. The name must be in CAPITALS - ie change NORMAL to DIFFERENCE.
myLayerRef.blendMode = BlendMode.NORMAL;
// select opacity in percentage
myLayerRef.opacity = 100;
// The following code strips the extension and writes tha text layer. fname = file name only
di=(docRef.name).indexOf(".");
fname = (docRef.name).substr(0, di);
//use extension if set
if ( ShowExtension == "y" )
I really appreciate the help.