Can you combine substring and indexOfChar in the same line?

Question

I have an HTTPResonse that when you get the body looks like this:

{"id":"/Project/34rxq38ntgrvxj7vkzqj8xe7v68"}

I want to get the Id from it to use later and I'm having trouble figuring out how to dynamically say start at Project/ and end at "}. The reason is that the id seems to change in length each time.

I did have

String i = response.getBody().subString(16,45);

but it fails if the length changes. I think I should do something like this to get the index of the last " and then use that as the length but I can't get it to compile.

String i = response.getBody().substring(16, indexofChar('"',16));

The error is:

Method does not exist or incorrect signature: void indexofChar(String, Integer)

What am I doing wrong?

Answer 1

indexOfChar() needs to operate on an instance of a string (it's not a static method)

e.g.

String myStr = 'test';
system.debug(myStr.indexOfChar('s'));

Trying to get at your value by substrings is a messy way to go about this though.

Deserializing the JSON, and then using String.split('/') is probably going to be a lot cleaner/readable/reliable

e.g.

public class myClass{
    String id;
}

String res = '{"id":"/Project/34rxq38ntgrvxj7vkzqj8xe7v68"}';
MyClass mc = (MyClass)JSON.deserialize(res, MyClass.class);
List<String> idParts = mc.id.split('/');
System.debug(idParts[2]); // should give you 34rxq38ntgrvxj7vkzqj8xe7v68

Answer 2

if you always expect that same estructure you can use response.getbody().substringbetween('t/','"');

Either using substringAfterLast('/').substringBefore('"'); would work too.

Take a look to the String Class documentation: https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_methods_system_string.htm