Regular Expressions replace characters other than Chinese characters, letters, and numbers

In this example, characters other than Chinese characters, letters, and numbers are replaced with null.

 

  ///   <Summary>
/// Replacement character
///   </Summary>
///   <Param name = "asstring"> </param>
///   <Returns> </returns>
Public   Static   String Trimcharacter ( String Asstring)
{
String Sresult =   "" ;
String Scharacterregx =   " [^ A-zA-Z0-9 \ u4e00-\ u9fff] " ;
RegEx rgval =   New RegEx (scharacterregx );
Sresult = Rgval. Replace (asstring, "" );
Return sresult;
}