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Javascript 正则表达式_3

发布时间：2024-08-27 21:37:36 来源：互联网

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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <script type="text/javascript">
        /*
                var str = "012345678901234567890123456789";
                var re = /123/;
                var globalre = /123/g;

                //非全局匹配
                var resultArray = re.exec(str);
                console.log(resultArray[0]);//输出123
                console.log(resultArray.index);//输出1
                console.log(globalre.lastIndex);//输出0

                var resultArray = re.exec(str);
                console.log(resultArray[0]);//输出123
                console.log(resultArray.index);//输出1
                console.log(globalre.lastIndex);//输出0

                //全局匹配
                var resultArray = globalre.exec(str);
                console.log(resultArray[0]);//输出123
                console.log(resultArray.index);//输出1
                console.log(globalre.lastIndex);//输出4

                var resultArray = globalre.exec(str);
                console.log(resultArray[0]);//输出123
                console.log(resultArray.index);//输出11
                console.log(globalre.lastIndex);//输出14


        */
        window.onload = function () {
            //Example one;
            var str1 = 'time 2015-10-8 11:21:23；time 1988-7-28 10:10:32；time 2013-1-19 12:25:45；time 2022-12-11 10:10:22；';
            var reg1 = /(\d{4})-(\d{1,2})-(\d{1,2})\s+(\d{1,2}):(\d{1,2}):(\d{1,2})/g;//\s表示空格 +：一个多个空格
            var arr = reg1.exec(str1);
            // console.log(arr);
            var result = allExec(reg1, str1);
            console.log(result);

            //Example two;
            var str2 = 'http://www.gurucv.com?cource=js&teacher=Cupid&typeCode=1';
            var result = urlToJson(str2);
            console.log(result);

            console.log(Math.abs(~2015));
            console.log(Math.ceil(011).toString(2));
        }

        //
        function allExec(reg, str) {
            if (!reg.global) {
                return reg.exec(str);
            }
            var a = [];//用来获取每次捕获的结果
            var result = null;
            while ((result = reg.exec(str)) != null) {
                a.push(result);//死循环
            }
            return a;
        }
        //
        function urlToJson(str) {
            var reg = /([^?=&]+)=([^=?&]+)/g;//排出？=& 等号左右两侧开头不能包括？=&
            //出现多次拿exec去匹配
            //var result = reg.exec(str);
            var result = null;
            var jsonLeft = "{", jsonRight = "}", jsonContent = "";

            while (result = reg.exec(str)) {
                for (var i = 1, len = result.length; i < len / 2; i = i + 2) {
                    jsonContent += '"' + result[i] + '":"' + result[i + 1] + '",';
                }
            }
            return jsonLeft + jsonContent + jsonRight;
        }
    </script>
</head>
<body>

</body>
</html>

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