日期正则表达式

Question

日期正则表达式 yyyy-MM-dd,yyyy/MM/dd,MM/dd/yyyy，一个正则表达式可以验证这三种还有一种格式是yyyyMMdd

Answer 1

var a = '2011-12-21';

var b = '2011/01/21';
var c = '20141230';

var d = '12/21/2011';
function test(s){
    var r1 = /^(\d{2})\/(\d{2})\/(\d{4})$/;
    if(r1.test(s)){
        s = RegExp.$3+'-'+RegExp.$1+'-'+RegExp.$2;
        return Boolean(+new Date(s));
    }else{
        var r1 = /^(\d{4})([-/]?)(\d{2})\2(\d{2})$/;
        if(r1.test(s)){
            s = RegExp.$1+'-'+RegExp.$3+'-'+RegExp.$4;
            return Boolean(+new Date(s));
        }else{
            return false;
        }
    }
}
console.log(test(a));
console.log(test(b));
console.log(test(c));
console.log(test(d));

Answer 2

这个要是用正则的话反而麻烦了，还是判断截取字符串再判断吧