C # regular expression to determine whether it is a number, whether it contains Chinese characters, and whether it is a combination of numbers and letters

// Determine whether the input contains Chinese or not. If the input contains Chinese, true public static bool haschinese (string content) is returned) {// judge whether it is a Chinese string regexstr = @ "[\ u4e00-\ u9fa5]"; if (RegEx. ismatch (content, regexstr) {log ("haschinese"); Return true ;}else {log ("has not Chinese"); Return false ;}} // determine whether the number is public static bool isinterger (string Str) {If (STR = "") {return false;} else {foreach (char C in Str) {If (char. isnumber (c) {continue;} else {return false ;}}return true ;}// only public static bool isintergerorletter (string content) can be judged by numbers or letters) {system. text. regularexpressions. regEx reg1 = new system. text. regularexpressions. regEx (@ "^ [A-Za-z0-9] + $"); Return reg1.ismatch (content );}