Make includes() exact with numbers JS

How do I make it show me accuracy in includes() or maybe another way…
For example I do.

array.filter(item => {
if(item?.about?.toLowerCase()?.includes(
  ("4")) && item?.about?.toLowerCase()?.includes(
    ("years") 
  )

But in the text itself it is written, for example, "We have existed for 40 years".
It recognizes for me the number 4 within the 40 and then it filters it.
what can we do ?

>Solution :

You can use Regex for this to include multiple test as a single pattern:

/(^4|[^\d]+4)[^\d]+years.*/i

Explanation:

1. (^4|[^\d]+4): Either string start with 4 or has a non-numeric character before it.
2. [^\d]+: Followed by at least 1 non-numeric character.
3. years: Followed by exact word years
4. .*: Means you can have any characters after it or be at the end.
5. /i: Means it will check case insensitively. So you do not have to do .toLowerCase()

   const data = [
     "We have existed for 40 years",
     "We have existed for 4 years",
     "We have existed for 44 years",
     "4 years at start",
     "4 is a random number in years"
   ]
   
   const output = data.filter((str) => {
     const regex = /(^4|[^\d]+4)[^\d]+years.*/i;
     return regex.test(str)
   });
   
   console.log(output)