从表示数组jquery的字符串中获取索引值

Question

given string is

var strg = "RoomItemsQuantity[items][1][itemId]"

I'm having the above string value.How can i get itemId from the string.

var index = strg.lastIndexOf("[");
var fnstrg = strg.substr(index+1);
var fnstrg = fnstrg.replace("]","");

I've done like this is there any easiest way to do this?

thanks,

Answer 1

This code...

var arr = "RoomItemsQuantity[items][1][itemId]".replace(/]/g, "").split("[")

Will result in an array like this:

["RoomItemsQuantity", "items", "1", "itemId"]

Then...

arr[arr.length - 1]

Will give you what you want.

Answer 2

If the above pattern is fixed, then you could use the following trick :

var myString = "RoomItemsQuantity[items][1][itemId]";
var myItemId = (myString+"[").split("][")[2]

Answer 3

You can use a regular expression like:

('RoomItemsQuantity[items][1][itemId]'.match(/([^\[]+)\]$/) || [])[1] // itemId

You can also use lookahead or lookbehind but support may not be available.