1234567891011121314151617Regex regex = new Regex(@"[/u00FF-/uFFFF]+");
　　// The characters, whoes value are smaller than 0xff, are not expected to be matched.
　　for (int i = 0; i < 0xff; i++) {
　　string s = new string(new char[] { (char)i });
　　Debug.Assert(
　　!regex.IsMatch(s),
　　string.Format("The character was not expected to be matched: 0x{0:X}!", i));
　　}
　　// However, the characters whoes value are greater than 0xfe are expected to be matched.
　　for (int i = 0xff; i <= 0xffff; i++) {
　　string s = new string(new char[] { (char)i });
　　Debug.Assert(
　　regex.IsMatch(s),
　　string.Format("The character was expected to be matched: 0x{0:X}!", i));
　　}

1234567891011121314151617var re = /[/u00FF-/uFFFF]+/;
　　// var re = /[/u00FF-/uFFFF]+/i;
　　for(var i=0; i<0xff; i++) {
　　var s = String.fromCharCode( i );
　　if ( re.test(s) ){
　　alert( 'Should not be matched: ' + i + '!' );
　　}
　　}
　　for(var i=0xff; i<=0xffff; i++) {
　　var s = String.fromCharCode( i );
　　if ( !re.test(s) ){
　　alert( 'Should be matched: ' + i + '!' );
　　}
　　}