检测八位数字是否为有效日期的正则

<html> <head> <title>测试八位数字是否为有效日期</title> </head> <script language="javascript"></script> <body>         <div> <span>String : </span><input id="str1" type="text" value="19990228" size="100"/>                  <span>Regex : </span><input id="str2" type="text"             value='^(?:(?:(?:(?=\d{2}(?:(?:[02468][048])|(?:[13579][26])))\d{4}02(?!00)[0-2]\d))|(?:\d{4}(?:(?:(?:(?:0[469])|(?:11))(?!00)(?:(?:[0-2]\d)|(?:30)))|(?:(?:(?:0[13578])|(?:1[02]))(?!00)(?:(?:[0-2]\d)|(?:3[01])))|(?:02(?!(?:00)|(?:29))[0-2]\d))))$'             size="100"/>                  <input type="button" value="OK" onclick="javascript:fun2();"/>         </div> </body> </html>

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检测八位数字是否为有效日期的正则

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