PS3 script to batch rename layers

You're in luck. I just finished writing this yesterday. :)

This will remove " copy", " copy 1"... etc from all open files. Let me know how it works out for you.

///////////////////////////////////////////////////////////////////////////////
// Script Name: RenameLayers.jsx
// Version: 1.0
// Date: 2/27/08
// Usage: Removes 'copy 1, copy 2, etc' from name of all layers
///////////////////////////////////////////////////////////////////////////////

#target photoshop
//$.localize = true;
var displayDialogMode = app.displayDialogs;

app.bringToFront();
app.bringToFront();
app.displayDialogs = DialogModes.NO;

processObjects(app.documents, processDocument,function () {alert("You have no documents open")})
app.displayDialogs = displayDialogMode;

///////////////////////////////////////////////////////////////////////////////
// Function: processObjects
// Usage: Runs theMainFunction on every object in list theObjects
// Input: List of objects (documents, layers, etc.), Function to run on each object, Function to run on parent if there are no object
// Return: value returned from function used
///////////////////////////////////////////////////////////////////////////////
function processObjects(theObjects, theMainFunction, theAlternateFunction) {
var returnValue = null;
if (theObjects.length ==0) {
if (!(theAlternateFunction == undefined) && !(theAlternateFunction == null) && !(theAlternateFunction == "")) {
returnValue = theAlternateFunction (theObjects.parent);
}
} else {
if (!(theMainFunction == undefined) && !(theMainFunction == null) && !(theMainFunction == "")) {
for (var i = theObjects.length -1; i> -1; i--) {
returnValue += theMainFunction (theObjects, i);
}
}
}
return returnValue;
}

///////////////////////////////////////////////////////////////////////////////
// Function: processDocument
// Usage: Processes layers of document with 'processLayer' function
// Input: Document object, Document object index
// Return: none
///////////////////////////////////////////////////////////////////////////////
function processDocument(objectRef, i) {
app.activeDocument = objectRef
processObjects(objectRef.layers, processLayer, null);
}

///////////////////////////////////////////////////////////////////////////////
// Function: processLayer
// Usage: Removes 'copy' from layer name (processes Layer Set contents)
// Input: Layer object, Layer Object index
// Return: none
///////////////////////////////////////////////////////////////////////////////
function processLayer(objectRef, i) {
if (objectRef.typename == 'LayerSet') {
var layerCount = processObjects(objectRef.layers, processLayer);
}
renameLayer(objectRef)
return 0
}

///////////////////////////////////////////////////////////////////////////////
// Function: renameLayer
// Usage: Removes 'copy' from layer name (processes Layer Set contents)
// Input: Layer object, Layer Object index
// Return: none
///////////////////////////////////////////////////////////////////////////////
function renameLayer(objectRef) {
var theRegEx = new RegExp(/^(.*)(copy(\s(\d)+)*)+$/)
if (theRegEx.test(objectRef.name)) {
var indexNumber = 0

indexnumber = objectRef.name.indexOf(" copy")
objectRef.name = objectRef.name.substr(0,indexnumber)
}
return 0
}