请教一个正则

请教一个正则：
数据有时候是这样：
["二s","李s","王s","一s"]
[{"DEVID":1,"Area":"广州","USERID":null,"USERNAME":"王s","DEVTYPE":null,"DevName":"iPad2","DevIMEI":"IPAD2346523985687","IsUsable":1,"BindDate":"2013-05-13T09:05:33","UPDATEUSER":null,"UPDATETIME":"0001-01-01T00:00:00"}]
或者
["二s","李s","王s","一s"]
或者
[{"DEVID":1,"Area":"广州","USERID":null,"USERNAME":"王s","DEVTYPE":null,"DevName":"iPad2","DevIMEI":"IPAD2346523985687","IsUsable":1,"BindDate":"2013-05-13T09:05:33","UPDATEUSER":null,"UPDATETIME":"0001-01-01T00:00:00"}]

在代码中如何判断这种字符中是否包含  ][  呢？

success: function (returnValue) {                    //select                    var returnJson = returnValue.split('][')[0] + ']';                    var returnValue1 = '[' + returnValue.split('][')[1];

这样有时会报错，我想用个正则来判断字符中是否存在 ][ 来截取数据

回复讨论(解决方案)

indexOf() 方法

你那不就是 json 吗？干嘛要字符串截取？

你那不就是 json 吗？干嘛要字符串截取？
["二s","李s","王s","一s"]这段要单独拿出 放在下拉框中

[{"DEVID":1,"Area":"广州","USERID":null,"USERNAME":"王s","DEVTYPE":null,"DevName":"iPad2","DevIMEI":"IPAD2346523985687","IsUsable":1,"BindDate":"2013-05-13T09:05:33","UPDATEUSER":null,"UPDATETIME":"0001-01-01T00:00:00"}]
这段要形成表格

有时候是有2段数据，有时候只有后面一段数据。所以我想判断一下是否有2段数据。该怎么写呢？

indexOf() 方法

var str="Hello world!"//值大于0，有2段数据，则截取。否则就是一段数据，直接赋值不截取。是这个意思吗？if(returnValue.indexOf("][") > 0) {   var returnJson = returnValue.split('][')[0] + ']';   var returnValue1 = '[' + returnValue.split('][')[1];...}else{  var returnValue；}

indexOf() 方法

<script type="text/javascript">function test(){    var returnValue = "[1][2]";if(returnValue.indexOf("][") > 0) {   var returnJson = returnValue.split('][')[0] + ']';   var returnValue1 = '[' + returnValue.split('][')[1];   alert(returnJson);   alert(returnValue1);}else{     alert(retuanValue);    }}</script><input type="button" value="测试" onclick="test()" /> //我这样测试了一下,var returnValue = "[1][2]"的时候是可以，但是var returnValue = "[1]";的时候就不行，该怎么做呢？