changeAllNames.jsx

/*
*Snippet to change target name project-wise.
*Comp names and layer names are going to be affected.
*I believe there are going to be problems with expressions.
*Though I'm not sure
*
*CC-BY, Nik Ska, 2015
*/

var wrongName = "СС";
var targetName = "WATWAT";


var howMuch = 0;

app.beginUndoGroup("Changeallnames");

for(var i = app.project.numItems; i > 0; i--){
    var thisItem = app.project.item(i);
    if(thisItem.name == wrongName){
        thisItem.name = targetName;
        howMuch++;
    }
    if(thisItem instanceof CompItem){
        for(var c = thisItem.layers.length; c > 0; c--){
            var thisLayer = thisItem.layers[c];
            if(thisLayer.name == wrongName){
                thisLayer.name = targetName;
                thisLayer.selected = true;
                thisItem.openInViewer();
                howMuch++
            }
        }
    }
}

alert("Changed " + String(howMuch) + " names");

app.endUndoGroup();