How do I get a substring between a string and the first occurrence of another string?

My attempt so far:

const myString = 'Hello my name is Barbara but i dont really like the name Barbara I prefer Barb'

const mySubString = myString.substring(
   myString.indexOf("Hello") + 6,
   myString.lastIndexOf("Barbara")
);
console.log(mySubString)

this returns my name is Barbara but i dont really like the name, but I need my name is.

And I don’t see a firstIndexOf() method..

>Solution :

Don’t use lastIndexOf if you want the first occurrence. indexOf gives the index of the first occurrence.

const myString = 'Hello my name is Barbara but i dont really like the name Barbara I prefer Barb'
const mySubString = myString.substring(
   myString.indexOf("Hello") + 6,
   myString.indexOf("Barbara") - 1
);
console.log('"' + mySubString + '"');