Regular expression to determine Chinese numbers and letters in js (example)_javascript skills

/*
判斷指定的內容是否為空，若為空則彈出警告框
*/
function isEmpty(theValue, strMsg){
if(theValue==""){
alert(strMsg "不能為空!");
return true;
}
return false;
}
/*
中文判斷函數，允許生僻字用英文“ *」取代
回傳true表示是符合條件，回傳false表示不符合
*/
function isChinese(str){
var badChar ="ABCDEFGHIJKLXYOPQRST ;
badChar = "0123456789";
badChar = " " "　";//半角與全角空格
badChar = "www.jb51.net不包含*或.的英文符號
if( ""==str){
return false;
}
for(var i=0;i var c = str.charAt(i);//字串str中的字元
if (badChar.indexOf(c) > -1){
return false;
}
}
return true;
}
/*
數字判斷函數，傳回true表示是全部數字，回傳false表示不全部是數字
*/
function isNumber(str){
if(""==str){
return false;
}
var reg = /D/;
return str.match(reg)==null;
}
/*
判斷給定的字串是否為指定長度的數字
是回傳true，不是回傳false
*/
function isNumber_Ex(str,len){
if(""==str){
return false;
}
if(str .length!=len){
return false;
}
if(!isNumber(str)){
return false;
}
return true;
}
/*
money判斷函數，允許第一位為"-"來表示欠錢
回傳true表示格式正確，回傳false表示格式錯誤
*/
function isMoney(str) {
if(""==str){
return false;
}
for(var i=0;i var c = str.charAt(i);
if(i ==0){
if(c!="-"&&(c
"9")){ return false;
}else if(c=="-"&&str.length ==1){
return false;
}
}else if(c
"9"){ return false;
}
}
return true true ;
}
/*
英文判斷函數，回傳true表示是全部英文，回傳false表示不全部是英文
*/
function isLetter(str){
if( ""==str){
return false;
}
for(var i=0;i var c = str.charAt(i);
if((c
"z ")&&(c"Z")){ return false;
}
}
return true;
}
/*
空格判斷，當包含有空格回傳false，當不包含一個空格回傳true
""不能被判斷
*/
function notInSpace(str){
if(""==str){
return false;
}
var badChar =" ";
badChar = "　";
for(var i=0;i var c = str.charAt(i);//字符串中的字符
if(badChar.indexOf(c) > -1){
return false;
}
}
return true;
}
/*
**號判斷函數，回傳true表示是**號，回傳false表示不符合規範
*/
function isFPH(str){
if(""==str){
return false;
}
for(var i=0;i var c = str.charAt(i);
if((c
"9") && (c!="-" )&&(c!=",")){ return false;
}
}
return true;
}
/*
電話判斷函數，允許「數字」、「;」、「-」、「(」、」)「，
true表示是電話號碼
*/
function isTelephone(str){
var trueChar = "() -;1234567890";
if(""==str){
return false;
}
for(var i=0;i var c = str.charAt(i);//字串str中的字元
if(trueChar.indexOf(c) == -1) return false;
}
return true;
}
/**
學制可以為1-7，也可以為3.5這種形式，不能超過7年或低於1年
*/
function isXZ(str){
if(""==str){
return false;
}
var reg = /^[1-6](.5)?$ /;
var r = str.match(reg);
if(null!=r){
return true;
}else{
if(str=="7") {
return true;
}else{
return false;
}
}
}
/*
判斷憑證編號是否符合要求，憑證編號包含中文、數字、大小寫字母、(、)、-
是回傳true，不是回傳false
*/
function isZSBH(str){
if(""==str){
return false;
}
for(var i=0;i var c = str.charAt(i);
alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
alpha = "abcdefghijMNOPQRSTUVWXYZ";
alpha = "abcdefghijmnopq. alpha = "()-";
if(!isChinese(c)&&!isNumber(c)&&alpha.indexOf(c)==-1){
return false;
}
}
return true;
}
/*
身分證判斷函數，是傳回true，不是回傳false
15位元數字，18位元數字或最後一位為X（大寫）
*/
function isSFZ(str){
if(""==str){
return false;
}
if(str.length!=15&&str.length!= 18){//身分證長度不正確
return false;
}
if(str.length==15){
if(!isNumber(str)){
return false ;
}
}else{
str1 = str.substring(0,17);
str2 = str.substring(17,18);
alpha = "X0123456789"; >if(!isNumber(str1)||alpha.indexOf(str2)==-1){
return false;
}
}
return true;
}
/ *
得到今天的年,月,日
呼叫方法：today = new getToday(); 則today.year為今天的年以此類推
*/
function getToday(){
this.now = new Date();
this.year = this.now.getFullYear();
this.month = this.now.getMonth();
this.day = this. now.getDate();
}

js determines numbers, letters, Chinese
1.
var reg = /^(w|[u4E00-u9FA5])*$/;
if(arr=username.match( reg))
{
ti=1;
return ture;
}
else
{
alert("Username is only allowed to be a mixture of English, numbers and Chinese characters ,nPlease check whether there are spaces or other symbols before and after");
ti=0;
return false;
}
2. Use regular expressions to limit the input content of the text box in the web form:
Use regular expressions to limit input to Chinese only: onkeyup="value=value.replace(/[^u4E00-u9FA5]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData ('text').replace(/[^u4E00-u9FA5]/g,''))"
Use regular expressions to limit the input of only full-width characters: onkeyup="value=value.replace(/[^uFF00 -uFFFF]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^uFF00-uFFFF]/g,''))"
Use regular expressions to limit input to numbers: onkeyup="value=value.replace(/[^d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text') .replace(/[^d]/g,''))"
Use regular expressions to limit input to numbers and English only: onkeyup="value=value.replace(/[W]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^d]/g,''))"

Number


Letters

-------------------------- -------------------------------------
/**
* Some commonly used JavaScript functions (methods)
*
* For ease of use, all methods are written as String objects
* Save them as .js files to easily expand string objects Function
*
* Method name function
* ----------- ----------------------- ----------
* Trim removes the first space
* Occurs counts the number of occurrences of the specified character
* isDigit checks whether it consists of numbers
* isAlpha checks whether it consists of numbers, letters and Underscores
* isNumber Check whether it is a number
* lenb Return the number of bytes
* isInChinese Check whether it contains Chinese characters
* isEmail Simple email check
* isDate Simple date check, successfully return the date Object
* isInList Checks whether there is a character character in the list
* isInList Checks whether there is a character character
in the list*/
/*** Remove leading and trailing spaces ***/
String.prototype.Trim = function() {
return this.replace(/(^s*)|(s*$)/g, "");
}
/*** Count the number of occurrences of the specified character ***/
String.prototype.Occurs = function(ch) {
// var re = eval("/[^" ch "]/g") ;
// return this.replace(re, "").length;
return this.split(ch).length-1;
}
/*** Check if it consists of numbers ***/
String.prototype.isDigit = function() {
var s = this.Trim();
return (s.replace(/d/g, "").length == 0);
}
/*** Check if it consists of numbers, letters and underscores ***/
String.prototype.isAlpha = function() {
return (this.replace(/w/g, "").length == 0);
}
/*** Check if it is a number ***/
String.prototype.isNumber = function() {
var s = this.Trim();
return (s.search(// ^[ -]?[0-9.]*$/) >= 0);
}
/*** Return the number of bytes ***/
String.prototype.lenb = function() {
return this.replace(/[^x00-xff]/g,"**").length;
}
/*** Check if it contains Chinese characters ***/
String.prototype.isInChinese = function( ) {
return (this.length != this.replace(/[^x00-xff]/g,"**").length);
}
/*** Simple email check ***/
String.prototype.isEmail = function() {
var strr;
var mail = this;
var re = /(w @w .w )(.{0,1}w* )(.{0,1}w*)/i;
re.exec(mail);
if(RegExp.$3!="" && RegExp.$3!="." && RegExp.$2! =".")
strr = RegExp.$1 RegExp.$2 RegExp.$3;
else
　if(RegExp.$2!="" && RegExp.$2!=".")
strr = RegExp.$1 RegExp.$2;
else
strr = RegExp.$1;
return (strr==mail);
}
/*** Simple date check, successfully returns date object ***/
String.prototype.isDate = function() {
var p;
var re1 = /(d{4})[Year./-](d{1,2})[Month./-]( d{1,2})[Day]?$/;
var re2 = /(d{1,2})[Month./-](d{1,2})[Day./-]( d{2})[year]?$/;
var re3 = /(d{1,2})[month./-](d{1,2})[day./-](d{ 4})[year]?$/;
if(re1.test(this)) {
p = re1.exec(this);
return new Date(p[1],p[2 ],p[3]);
}
if(re2.test(this)) {
p = re2.exec(this);
return new Date(p[3],p [1],p[2]);
}
if(re3.test(this)) {
p = re3.exec(this);
return new Date(p[3] ,p[1],p[2]);
}
return false;
}
/*** Check if there is a character character in the list ***/
String.prototype.isInList = function(list) {
var re = eval("/[" list "]/"); <script> <BR>function check() <BR>{ <BR>if(!isNaN(document.all.form.str.value)) <BR>{ <BR>alert("数字"); <BR>} <BR></script>return re.test(this); <script> <BR>function check() <BR>{ <BR>var str = /[_a-zA-Z]/; <BR>if(str.test(document.all.form.str.value)) <BR>{ <BR>alert("字母"); <BR>} <BR>} <BR></script>}