How to fetch substring in required format from a String in java?

I have the String in the below format.

"resourceId=/subscriptions/subscription_id/resourceGroups/rg_name/providers/Microsoft.Compute/virtualMachines/resource_name/i=xxxxxxxxx/y=2021/m=03/d=13/h=15/m=00/PT1H.json"

I'm trying to fetch the substring in the below manner by ideally splitting the string based on "/" and fetch the first part of string until resource_name :

/subscriptions/subscription_id/resourceGroups/rg_name/providers/Microsoft.Compute/virtualMachines/resource_name

How to achieve this format either by using substring or regEx in java?

Edited

In the given string ,resource_name will be substituted with vm_name or akv_name. It will be not be resource_name for ever in the string, have given generic name.

Basically, I need to go until virtualMachines from the start and fetch the resource_name which is appended next to virtualMachines by a slash

Then in this scenario.. how to handle it?

There are a few ways to do this.

You can use a Pattern and Matcher, to isolate the data using a regular expression capture.

Or, you can use a replace procedure to remove the data you don't want.

Or, finally, you can use an indexOf procedure to acquire an end-index for a substring method.

Because of the simplicity, I recommend the final option.

Consider the following method, parse, which takes the String value as the first parameter, and the starting and ending String values as the second and third parameter.

String parse(String string, String start, String end) {
    int indexOf = string.indexOf(start);
    return string.substring(indexOf, string.indexOf(end) + end.length());
}

And, here is an example of it's usage.

String string = "resourceId=/subscriptions/subscription_id/resourceGroups/rg_name/providers/Microsoft.Compute/virtualMachines/resource_name/i=xxxxxxxxx/y=2021/m=03/d=13/h=15/m=00/PT1H.json";
String value = parse(string, "subscriptions", "resource_name");
System.out.println(value);

Output

subscriptions/subscription_id/resourceGroups/rg_name/providers/Microsoft.Compute/virtualMachines/resource_name

I have two solutions.
using indexOf:

String input = "resourceId=/subscriptions/subscription_id/resourceGroups/rg_name/providers/Microsoft.Compute/virtualMachines/resource_name/i=xxxxxxxxx/y=2021/m=03/d=13/h=15/m=00/PT1H.json";

// Find the index of "resource_name"
int endIndex = input.indexOf("/resource_name");

// Extract the substring until "resource_name"
String substring = input.substring(0, endIndex);

System.out.println(substring);

using replaceAll:

String input = "resourceId=/subscriptions/subscription_id/resourceGroups/rg_name/providers/Microsoft.Compute/virtualMachines/resource_name/i=xxxxxxxxx/y=2021/m=03/d=13/h=15/m=00/PT1H.json";

String regex = "/resource_name.*$";
String substring = input.replaceAll(regex, "");

System.out.println(substring);

In my end, it works well. Hope these would give you help.

You can do something like this,

 String sample = "resourceId=/subscriptions/subscription_id/resourceGroups/rg_name/providers/Microsoft.Compute/virtualMachines/resource_name/i=xxxxxxxxx/y=2021/m=03/d=13/h=15/m=00/PT1H.json";
 StringBuilder subString = new StringBuilder(sample.substring(11, sample.indexOf("/i=xxxxxxxxx"));
 String endString = sample.substring(sample.indexOf("/i=xxxxxxxxx"));
 int lastIndex=subString.lastIndexOf("/");
 new StringBuilder(subString.replace(lastIndex,subString.length(),"/vm_name").append(endString));