getFileExtension.js

function getFileExtension(i) {
    
    // i will be a string, but it may not have a file extension.
    // return the file extension (with no period) if it has one, otherwise false
    
    var pat1= /(.*\.)(\w+)/i;
 if (i.match(pat1)){
    //alert( i.replace( /(.*\.)(\w+)/i ,'$2') ) ;
var out=i.replace( pat1 ,'$2')  ;
alert(out);
   return out;
}else{
    return false;
}

}