Check if a string contains a strict substring

Question

I have the next situation:
I want to check if in const str = "hello world" is the word world , not wor , not worl , but strict world . I know that exists includes() method, but it is not working as i described.
How to solve the question?

Answer 1

 const str = "hello world" const sub1 = "world" const sub2 = "wor" let strictSub = (a, b) => a.split(' ').includes(b) console.log(strictSub(str, sub1)) console.log(strictSub(str, sub2))

This would work

Answer 2

Using Regex :

const str1 = "hello world"
const str2 = "helloooo world"

const regex = /\bhello\b/

regex.test(str1) // true
regex.test(str2) // false