常用验证的正则表达式

// 身份证验证
jQuery.validator.addMethod("isUcrd", function(value, element) {
var crd =/^[1-9]\d{5}[1-9]\d{3}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{3}([0-9]|X)$/;
//var crd =/^(\d{15}$|^\d{18}$|^\d{17}(\d|X|x))$/;
return this.optional(element) || (crd.test(value));
}, "请正确填写您的身份证"
);

// 手机号码验证
jQuery.validator.addMethod("isMobile", function(value, element) {
var length = value.length;
//var mobile = /^(1[3|5|7|8|][0-9]{9})|(1[4][7|8|9][0-9]{8})$/;
var mobile = /^(1[3|5|8|][0-9]{9})|(17[0|5|6|7|8][0-9]{8})|(14[5|7|][0-9]{8})$/;
return this.optional(element) || (length == 11 && mobile.test(value));
}, "请正确填写您的手机号码"
);
// 电话号码验证
jQuery.validator.addMethod("isTel", function(value, element) {
var tel = /^\d{3,4}-?\d{7,9}$/; //电话号码格式010-12345678
return this.optional(element) || (tel.test(value));
}, "请正确填写您的电话号码"
);

// 传真验证
jQuery.validator.addMethod("isFax", function(value, element) {
var tel = /^\d{3,4}-?\d{7,9}$/; //电话号码格式010-12345678
return this.optional(element) || (tel.test(value));
}, "请正确填写您的传真"
);

// 联系电话(手机/电话皆可)验证
jQuery.validator.addMethod("isPhone", function(value,element) {
var length = value.length;
var mobile = /^(((13[0-9]{1})|(15[0-9]{1}))+\d{8})$/;
var tel = /^\d{3,4}-?\d{7,9}$/;
return this.optional(element) || (tel.test(value) || mobile.test(value));
}, "请正确填写您的联系电话"
);

// 字母和数字的验证
jQuery.validator.addMethod("chrnum", function(value, element) {
var chrnum = /^([a-zA-Z0-9]+)$/;
return this.optional(element) || (chrnum.test(value));
}, "只能输入数字和字母(字符A-Z, a-z, 0-9)"
);

// 邮箱验证
jQuery.validator.addMethod("isMailCode", function(value, element) {
var reg = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/;
return this.optional(element) || (reg.test(value));
}, "请正确填写您的邮箱"
);

// 正整数或非负小数判断
jQuery.validator.addMethod("decimal", function(value,element) {
var ints =/^[0-9]\d*$/;
var doubles = /^(([1-9]+)|([0-9]+.[0-9]{1,4}))$/;
return this.optional(element) || (ints.test(value)) || (doubles.test(value));
}, "只能输入非负数，小数点后最多只能有4位"
);

限制输入空格
<input type="text" onkeyup="this.value=this.value.replace(/^ +| +$/g,'')">