JS基础教程――正则表达式示例(推荐)

// 清除两边的空格   JS中需要自己写正则，JQ中可直接调用$.trim(str)去除字符串前后空格String.prototype.trim = function() {  return this.replace(/(^/s*)|(/s*$)/g, ''); }; // 合并多个空白为一个空白 String.prototype.ResetBlank = function() {  var regEx = //s+/g;  return this.replace(regEx, ' '); }; // 保留数字 String.prototype.GetNum = function() {  var regEx = /[^/d]/g;  return this.replace(regEx, ''); }; // 保留中文 String.prototype.GetCN = function() {  var regEx = /[^/u4e00-/u9fa5/uf900-/ufa2d]/g;  return this.replace(regEx, ''); }; // String转化为Number String.prototype.ToInt = function() {  return isNaN(parseInt(this)) ? this.toString() : parseInt(this); }; // 得到字节长度 String.prototype.GetLen = function() {  var regEx = /^[/u4e00-/u9fa5/uf900-/ufa2d]+$/;  if (regEx.test(this)) {   return this.length * 2;  } else {   var oMatches = this.match(/[/x00-/xff]/g);   var oLength = this.length * 2 - oMatches.length;   return oLength;  } }; // 获取文件全名 String.prototype.GetFileName = function() {  var regEx = /^.*//([^///?]*).*$/;  return this.replace(regEx, '$1'); }; // 获取文件扩展名 String.prototype.GetExtensionName = function() {  var regEx = /^.*//[^//]*(/.[^/./?]*).*$/;  return this.replace(regEx, '$1'); }; //替换所有String.prototype.replaceAll = function(reallyDo, replaceWith, ignoreCase) {  if (!RegExp.prototype.isPrototypeOf(reallyDo)) {   return this.replace(new RegExp(reallyDo, (ignoreCase ? "gi" : "g")), replaceWith);  } else {   return this.replace(reallyDo, replaceWith);  } }; //格式化字符串 add By 刘景宁 2010-12-09 String.Format = function() {  if (arguments.length == 0) {   return '';  }  if (arguments.length == 1) {   return arguments[0];  }  var reg = /{(/d+)?}/g;  var args = arguments;  var result = arguments[0].replace(reg, function($0, $1) {   return args[parseInt($1) + 1];  });  return result; }; // 数字补零 Number.prototype.LenWithZero = function(oCount) {  var strText = this.toString();  while (strText.length < oCount) {   strText = '0' + strText;  }  return strText; }; // Unicode还原 Number.prototype.ChrW = function() {  return String.fromCharCode(this); }; // 数字数组由小到大排序 Array.prototype.Min2Max = function() {  var oValue;  for (var i = 0; i < this.length; i++) {   for (var j = 0; j <= i; j++) {    if (this[i] < this[j]) {     oValue = this[i];     this[i] = this[j];     this[j] = oValue;    }   }  }  return this; }; // 数字数组由大到小排序 Array.prototype.Max2Min = function() {  var oValue;  for (var i = 0; i < this.length; i++) {   for (var j = 0; j <= i; j++) {    if (this[i] > this[j]) {     oValue = this[i];     this[i] = this[j];     this[j] = oValue;    }   }  }  return this; }; // 获得数字数组中最大项 Array.prototype.GetMax = function() {  var oValue = 0;  for (var i = 0; i < this.length; i++) {   if (this[i] > oValue) {    oValue = this[i];   }  }  return oValue; }; // 获得数字数组中最小项 Array.prototype.GetMin = function() {  var oValue = 0;  for (var i = 0; i < this.length; i++) {   if (this[i] < oValue) {    oValue = this[i];   }  }  return oValue; }; // 获取当前时间的中文形式 Date.prototype.GetCNDate = function() {  var oDateText = '';  oDateText += this.getFullYear().LenWithZero(4) + new Number(24180).ChrW();  oDateText += this.getMonth().LenWithZero(2) + new Number(26376).ChrW();  oDateText += this.getDate().LenWithZero(2) + new Number(26085).ChrW();  oDateText += this.getHours().LenWithZero(2) + new Number(26102).ChrW();  oDateText += this.getMinutes().LenWithZero(2) + new Number(20998).ChrW();  oDateText += this.getSeconds().LenWithZero(2) + new Number(31186).ChrW();  oDateText += new Number(32).ChrW() + new Number(32).ChrW() + new Number(26143).ChrW() + new Number(26399).ChrW() + new String('26085199682010819977222352011620845').substr(this.getDay() * 5, 5).ToInt().ChrW();  return oDateText; }; //扩展Date格式化 Date.prototype.Format = function(format) {  var o = {   "M+": this.getMonth() + 1, //月份     "d+": this.getDate(), //日     "h+": this.getHours() % 12 == 0 ? 12 : this.getHours() % 12, //小时     "H+": this.getHours(), //小时     "m+": this.getMinutes(), //分     "s+": this.getSeconds(), //秒     "q+": Math.floor((this.getMonth() + 3) / 3), //季度     "S": this.getMilliseconds() //毫秒    };  var week = {   "0": "/u65e5",   "1": "/u4e00",   "2": "/u4e8c",   "3": "/u4e09",   "4": "/u56db",   "5": "/u4e94",   "6": "/u516d" };  if (/(y+)/.test(format)) {   format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));  }  if (/(E+)/.test(format)) {   format = format.replace(RegExp.$1, ((RegExp.$1.length > 1) ? (RegExp.$1.length > 2 ? "/u661f/u671f" : "/u5468") : "") + week[this.getDay() + ""]);  }  for (var k in o) {   if (new RegExp("(" + k + ")").test(format)) {    format = format.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));   }  }  return format; } Date.prototype.Diff = function(interval, objDate) {  //若参数不足或 objDate 不是日期类型回传 undefined  if (arguments.length < 2 || objDate.constructor != Date) { return undefined; }  switch (interval) {   //计算秒差                 case 's': return parseInt((objDate - this) / 1000);    //计算分差   case 'n': return parseInt((objDate - this) / 60000);    //计算差   case 'h': return parseInt((objDate - this) / 3600000);    //计算日差   case 'd': return parseInt((objDate - this) / 86400000);    //计算周差   case 'w': return parseInt((objDate - this) / (86400000 * 7));    //计算月差   case 'm': return (objDate.getMonth() + 1) + ((objDate.getFullYear() - this.getFullYear()) * 12) - (this.getMonth() + 1);    //计算年差   case 'y': return objDate.getFullYear() - this.getFullYear();    //输入有误   default: return undefined;  } }; //检测是否为空 Object.prototype.IsNullOrEmpty = function() {  var obj = this;  var flag = false;  if (obj == null || obj == undefined || typeof (obj) == 'undefined' || obj == '') {   flag = true;  } else if (typeof (obj) == 'string') {   obj = obj.trim();   if (obj == '') {//为空    flag = true;   } else {//不为空    obj = obj.toUpperCase();    if (obj == 'NULL' || obj == 'UNDEFINED' || obj == '{}') {     flag = true;    }   }  }  else {   flag = false;  }  return flag;