Retrieve number from string via JS regex

Question

I'm trying to retrieve a certain number from a string. But i can't figure out how to isolate the part i need.

The string:

https://intra.site.com/departments/travel/Lists/Booking/fd_Item_Display.aspx?List=8af14ed7-3bde-4ec0-b62a-9516324c967e&ID=15&Source=https%3A%2F%2Fintra%2Emonjasa%2Ecom%2Fdepartments%2Ftravel%2FPages%2Fdefault%2Easpx&ContentTypeId=0x0100B7DC1AFF519B6343BC8014EB1910DFAB

I need the number after ID=.

I did try to use string.replace() without luck.

How could I do this with regex?

Answer 1

Check this out :

function getParameterByName(url, parameter) {
 var regex = new RegExp("[\\?&]" + parameter + "=([^&#]*)"),
 results = regex.exec(url);
 return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
}
var url = 'https://intra.site.com/departments/travel/Lists/Booking/fd_Item_Display.aspx?List=8af14ed7-3bde-4ec0-b62a-9516324c967e&ID=15&Source=https%3A%2F%2Fintra%2Emonjasa%2Ecom%2Fdepartments%2Ftravel%2FPages%2Fdefault%2Easpx&ContentTypeId=0x0100B7DC1AFF519B6343BC8014EB1910DFAB';
var parameter = 'ID';
console.log( getParameterByName(url, parameter) );
// Log => 15

Answer 2

You can use:

var str = 'https://intra.site.com/departments/travel/Lists/Booking/fd_Item_Display.aspx?List=8af14ed7-3bde-4ec0-b62a-9516324c967e&ID=15&Source=https%3A%2F%2Fintra%2Emonjasa%2Ecom%2Fdepartments%2Ftravel%2FPages%2Fdefault%2Easpx&ContentTypeId=0x0100B7DC1AFF519B6343BC8014EB1910DFAB';
var id = (str.match(/&ID=([^&]*)/i) || ['', ''])[1];
//=> 15

• TietjeDK: Thx m8 - this works perfectly. I will mark as correct answer in 10 min.

Answer 3

Try this. Easier to understand.

 
 function getID()
 {
 
 var str = "https://intra.site.com/departments/travel/Lists/Booking/fd_Item_Display.aspx?List=8af14ed7-3bde-4ec0-b62a-9516324c967e&ID=15&Source=https%3A%2F%2Fintra%2Emonjasa%2Ecom%2Fdepartments%2Ftravel%2FPages%2Fdefault%2Easpx&ContentTypeId=0x0100B7DC1AFF519B6343BC8014EB1910DFAB";
 var id = str.match(/ID=(\d*)/)[1]; 
 
 alert(id);
 
 }

<input type="button" onclick="getID()" value="Click me">