Regex to get a specific query string variable in a URL

Question

I have a URL like

server/area/controller/action/4/?param=2"

in which the server can be

http://localhost/abc
https://test.abc.com
https://abc.om

I want to get the first character after "action/" which is 4 in the above URL, with a regex. Is it possible with regex in js, or is there any way?

Answer 1

Use regex \\d+(?=\\/\\?)

var url = "server/area/controller/action/4/?param=2"; 
var param = url.match(/\d+(?=\/\?)/);

Test code here .

Answer 2

Using this regex in JavaScript:

action/(.)

Allows you to access the first matching group, which will contain the first character after action/ -- see the examples at JSFiddle

Answer 3

这种方式将URL分割为/字符，并提取最后一个元素

var url = "server/area/controller/action/4/?param=2".split ('/').slice (-2,-1)[0];