That would work for you and for me, but would it work for everyone? alert( isUpperCase('JÖRN') ? 'good' : 'bad' ); // ;-) -Mike
_____ From: Karl Swedberg Shouldn't be too much work. Wouldn't this do it? function isUpperCase( string ) { return /^[A-Z]+$/.test(string); } On Aug 8, 2009, at 8:34 PM, Michael Geary wrote: If you want to check that the string contains *only* uppercase characters and no "case-less" characters (so that "ABC" would return true but "A B C" would return false), that would be a bit more work.