How to count the length of match string if we have only its length and its regular expression in javascript ? this is one hackerrank problem.

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JavaScript

Input:-  
((ab)|(ba)) 2  
((a|b)*) 5  
((a*)(b(a*))) 100


Output:-
2  
32  
100


here we have Only regex(r) and string length(l) as a parameter in function.....from these two parameter we have to find count of string which is match to our regex.

What I have tried:

JavaScript

var count = 0;

for(var i=l;i>0;i--)
{

    if(r.match(l))
    {
       count++;
    }

}

console.log(count);

Posted 23-Oct-19 2:30am

Akash Tawade

Updated 23-Oct-19 5:08am

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F-ES Sitecore 23-Oct-19 8:44am

Why does that input give those outputs? I don't see the relationship.

Akash Tawade 24-Oct-19 4:10am

There ((ab)|(ba)) is a regular expression.....and 2 is fixed length of that string...we have to find count of matched length from regular expression and fixed length of string

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OriginalGriff · Answer 1 · 2019-10-23T05:09:00

Go back to where you got the task, and read the instructions again.
The first regex is fixed length: if it matches with data, the match string will always be a fixed length of two characters.
The other two are variable length, and without knowing something about the data it is processing you cannot say "The matched string length will be nnn" because in the middle case it could be anything from 0 on up, and the last case "it's odd" is the only thing we can infer.

I suspect you have either missed part of the question, or not given it to us.

Either way, it's effectively homework, and we don't do that for you.