Dynamic value with regexp gives null result

March 22, 2023

here is my code, where i am trying to get different values using regexp, but getting only null as result.

const str = '12345';

for(let i = 1; i <= 4; i++){
 let count = `\d{${i}}`;
 let reg = new RegExp(count, 'g');
 const match = str.match(reg);
 console.log(match); //getting null
}

giving the result only null. any one help me to understand the issue here?

>Solution :

The \ in the count regex string needs to be escaped with another \ from the looks of things:

const str = '12345';

for(let i = 1; i <= 4; i++){
 let count = `\\d{${i}}`;
 let reg = new RegExp(count, 'g');
 const match = str.match(reg);
 console.log(match); //getting null
}