grab just the filename without the extension

var filename1: String = "monster.jpg";
var filename2: String = "big.fat.hippo.flv";

filename1 = filename1.replace( new RegExp( "(.*)\.(.*)", "g" ), "$1" );
filename2 = filename2.replace( new RegExp( "(.*)\.(.*)", "g" ), "$1" );

trace(filename1); //monster
trace(filename2); //big.fat.hippo