正则表达式的各种用法

表单验证只能输入数字和点，否则就输入不进去，用的事件是keyup

obj.value = obj.value.replace(/[^d.]/g,""); //清除"数字"和"."以外的字符
obj.value = obj.value.replace(/^./g,""); //验证第一个字符是数字
obj.value = obj.value.replace(/.{2,}/g,"."); //只保留第一个, 清除多余的
obj.value = obj.value.replace(".","$#$").replace(/./g,"").replace("$#$",".");
obj.value = obj.value.replace(/^(-)*(d+).(dd).*$/,'$1$2.$3'); //只能输入两个小数
obj.value = obj.value.replace(/d{14,}/g, obj.value.slice(0,14));

 输入银行卡号自动四位加空格

<input type="tel" v-model="mobile" placeholder="输入" maxlength="19">

 

watch:{

　　mobile(newValue,oldValue){

　　　　this.mobile  =  newValue.length  >  oldValue.length  ?  newValue.replace(/s/g,'').replace(/D/g,'').replace(/(d{4})(d{0,4})(d{0,4})(d{0,4})/g,  '$1 $2 $3 $4')  :  this.mobile.trim()

　　}

}

给数字加千分符

<script language="JavaScript" type="text/javascript">
function formatNumber(num){
if(!/^(+|-)?(d+)(.d+)?$/.test(num)){
return num;
}
var a = RegExp.$1,b = RegExp.$2,c = RegExp.$3;
var re = new RegExp("(\d)(\d{3})(,|$)");
while(re.test(b)){
b = b.replace(re,"$1,$2$3");
}
return a +""+ b +""+ c;
}
var num=3243245134151343.18787;
console.log(formatNumber(num))
/*alert("num="+num+"，四舍五入："+Math.round(num)+"，两位有效数字："+num.toFixed(2)+"，添加千位分隔符："+formatNumber(num)); */
</script>

/* 金额转千分位格式 */
function formatMoney(num) {
    if(num || num == '0'){
        num = parseFloat(num, 10);
        return (num.toFixed(2) + '').replace(/d{1,3}(?=(d{3})+(.d*)?$)/g, '$&,');
    }else{
        return '';
    }
}
修改后的如下：

formatMoney(num) {
    num = num.replace(/[^d+$]/ig,'')
    if(num || num == '0'){
        num = parseFloat(num,10);
        return (num + '').replace(/d{1,3}(?=(d{3})+(.d*)?$)/g, '$&,');
    }else{
        return '';
    }
}

允许输入负1的加入千分位

formatMoney(num) {

// 当status值为3时允许输入-1，其它负数不允许

if( /^-1$/.test(num) ) {

return num;

} else if( /^-1d+$/.test(num) ) {

return '-1'

} else if( !/^-$/.test(num) ) {

num = num.replace(/[^d+$]/ig,'')

if(num || num == '0'){

num = parseFloat(num, 10);

return (num + '').replace(/d{1,3}(?=(d{3})+(.d*)?$)/g, '$&,');

}else{

return '';

}

} else {

return num

}

 

}

　　function toThousands(num) {
            var result = '';
            num = Number(num.toString() || 0).toFixed(2);
            var numAry = num.toString().split(".");
            var preNum = numAry[0];
            var lastNum = numAry[1];
  

            while (preNum.length > 3) {
                result = ',' + preNum.slice(-3) + result;
                preNum = preNum.slice(0, preNum.length - 3);
            }
            if (preNum) {
                result = preNum + result;
            }
            result=result+"."+lastNum;

            return result;
        }

// 如下是支持边输入边加千分位并且保留两位小数

formatMoney(num) {
     num = num.replace(/[^d+|.d*$]/ig,'')
    if(num || num == '0'){
        if(/.+/ig.test(num) && num.split('.')[1].length>2){
            num = Number(num.split(',').join('')).toFixed(2);
        }
        return (num+'').replace(/d{1,3}(?=(d{3})+(.d*)?$)/g, '$&,');
    }else{
        return '';
    }
}

修改如下：

function toThousands(num) {

　　　　num = num.replace(/[^d+|.?$]/ig,'');
            var result = '';
            num = Number(num.toString() || 0).toFixed(2);
            var numAry = num.toString().split(".");
            var preNum = numAry[0];
            var lastNum = numAry[1];
  

            while (preNum.length > 3) {
                result = ',' + preNum.slice(-3) + result;console.log(result);
                preNum = preNum.slice(0, preNum.length - 3);console.log(preNum);
            };
            if (preNum) {
                result = preNum + result;
            }
            result=result+"."+lastNum;


            return result;
        }

/* 千分位转非千分位金额 */
function formatNumber (money) {
    var newNumber;
    newNumber = money && money.split(',').join('');
    return newNumber;
}

获取href里面带的某一个参数

uri =' http://community.antfortune.net/community/comment.htm?commentId=2016090102900100017010&topicId=2088102147230111'
var value = uri.match(new RegExp('[?&]' + param + '=([^&]*)(&?)', 'i')); //param是找的关键字例如commentId

(value里输出来的值如右侧  ["?commentId=2016090102900100017010&", "2016090102900100017010", "&"] )

return value ? decodeURIComponent(value[1]) : value;

匹配图片var regImg=/(<img[^>]*srcs*=s*"[^>"]*.(?:png|jpg|bmp|gif)"[^>]*>)/;

后端返回的可能是U_1或S_2等等
var reg = /({{([a-z]_[0-9]+)}})+/gi;
var str1 = $content.replace(reg, function (r, $1, $2) {
    if (/^U/.test($2)) {
        var uIndex = $2.substr($2.length - 1);

        var ATUSRs = (uIndex==2)? $referenceMap.ATUSR[0].atUserId: $referenceMap.ATUSR[uIndex].atUserId;
        if(ATUSRs && uIndex!=2){
            return '<span class="friends" userid='+$referenceMap.ATUSR[uIndex].atUserId+'>'+$referenceMap.ATUSR[uIndex].referString+'</span>';
        }else if(uIndex==2 && ATUSRs){
            return '<span class="friends" userid='+$referenceMap.ATUSR[0].atUserId+'>'+$referenceMap.ATUSR[0].referString+'</span>';
        }else{
            return '<span class="friends" userid="">'+$referenceMap.ATUSR[uIndex].referString+'</span>';
        }
    };

if (/^S/.test($2)) {
    var uIndex = $2.substr($2.length - 1);
    return '<span class="atFriend">'+$referenceMap.STOCK[uIndex].referString+'</span>';
};

exec方法 (获取浏览器里的cookie里的某一个key及value值)
var m = new RegExp('\b' + key + '\=([^;]+)').exec(document.cookie);

var str = "session.cookieNameId=ALIPAYJSESSIONID; ctoken=W7QjPHxCLOeEv1E5; ALIPAYJSESSIONID=GZ005V4hQPczTAWj8zqPq7SyST3mLyauthcenterGZ00";
//str里存的是电脑网页里的cookie的值，想获取cookie里的ctoken的值

/ctoken=([^;]+)/g.exec(str)    得出结果  ["ctoken=W7QjPHxCLOeEv1E5", "W7QjPHxCLOeEv1E5"] 

注：把上面这行正则改成用new regexp的形式去写就是第一行的那种写法，key是变量，这里就是指ctoken,  str里就是document.cookie里的值

//

身份证号码的*替换

str = Regex.Replace(str, "(\d{4})(\d+)(\d{4})", "$1***********$3");

String.prototype.escapeHTML = function () {                                       
  return this.replace(/&/g,'&amp;').replace(/>/g,'&gt;').replace(/</g,'&lt;').replace(/"/g,'&quot;');
}; //将后台返回来的标签元素转变成让标签显示在浏览器上

用正则匹配返回日期
new BaseJs().dateFormat(v, "{y}{mm}{d} {h}:{m}")

dateFormat: function (time, tpl) {
    var zeroFix = function (d) {
        if (d < 10)
            return "0" + d;
        return d;
    };

    var date = new Date(time),
        year = date.getFullYear(),
        years = date.getFullYear(),
        month = zeroFix(date.getMonth() + 1)
    months = zeroFix(date.getMonth() + 1),
        day = zeroFix(date.getDate()),
        days = zeroFix(date.getDate()),
        hour = zeroFix(date.getHours()),
        minute = zeroFix(date.getMinutes()),
        second = zeroFix(date.getSeconds());
    var nowDate = new Date(),
        nowYear = zeroFix(nowDate.getFullYear()),
        nowMonth = zeroFix(nowDate.getMonth() + 1),
        nowDay = zeroFix(nowDate.getDate());

    return tpl.replace(/{([^{}]+)}/g, function (a, b) {
        switch (b) {
            case "y":
                year = (years == nowYear)?  "": years+"-";
                return year;
            case "mm":
                if(years == nowYear && months == nowMonth && days == nowDay){
                    month = "今天";
                }else if (years == nowYear && months == nowMonth && days == nowDay-1){
                    month = "昨天";
                }else{
                    month = month+"-";
                };
                return month;
            case "d":
                if(years == nowYear && months == nowMonth && days == nowDay || years == nowYear && months == nowMonth && days == nowDay-1){
                    day = "";
                }
                return day;
            case "h":
                return hour;
            case "m":
                return minute;
            case "s":
                return second;
        }
    });
},