Javascript regex for validating filenames

Question

I have a regexp to validate file names. Here is it:

/[0-9a-zA-Z^&'@{}[],$=!-#().\%+~\_ ]+$/

It should allow file names like this:

aaa
aaa.ext
a#
A9#.ext

The following characters are not allowed / : * ? " < > |

The problem is that file names like *.txt or /kk passes the validation. I am doing validation with keyup event. So when I put one extra character after not allowed one it shows that everything is correct.

Answer 1

For Windows names.

var isValid=(function(){
  var rg1=/^[^\/:*?"<>|]+$/; // forbidden characters  / : * ? " < > |
  var rg2=/^./; // cannot start with dot (.)
  var rg3=/^(nul|prn|con|lpt[0-9]|com[0-9])(.|$)/i; // forbidden file names
  return function isValid(fname){
    return rg1.test(fname)&&!rg2.test(fname)&&!rg3.test(fname);
  }
})();

isValid('file name');