Record the formal use, verify Chinese, English, numerals, underline

<summary>///Calculation of characters (Chinese two)///</summary>//<param name= "str" &GT;&LT;/PARAM&G
        T <returns></returns> static int calstringlength (string str) {return system.te Xt.  
        Encoding.Default.GetByteCount (str); }///<summary>//Verify whether it is Chinese, English, digital, underline,-///</summary>//<param name= "str
            "></param>///<returns></returns> static bool Validstring (String str) {
            Regex re = new regex (@ "^[\u4e00-\u9fa5\w]+$");

            Regex re = new regex (@ "^[_\-a-za-z0-9\u4e00-\u9fa5]+$"); Whether to find a match to return re.

        IsMatch (str); }///<summary>//To replace characters other than Chinese, English, numerals, underscores,-//</summary>//<param name= " Str "></param> static void Matches (String str) {str= regex.replace (str, @" [^_\-a-za-z0 -9\u4e00-\u9fa5] "," "); }