title: How to match all different symbols from empty string with RegularExpression attribute in MVC
body: <p>I have a strange problem - I try to match all possible symbols about my UserName TextBox in my Login page and this attribute must be throw your ErrorMessage when the current box is empty. I tried with   <code>[^.+$]</code>   but this regex matched just one symbol, after that  I tryed with   <code>^[.+]$</code>   and this matched literal sense of char "." (dot). I tried many other cases and regexes, but the attribute do not give me desired result.</p>