How do I add variables in regex in javascript

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I want to add variables in regex, so i can update the regex frequently in function call depending on the parameters.

What I have tried:

JavaScript

let regex = '/year B.Tech sem Sem/g';
let year = 'II';
let sem = 'I';
regex = regex.replace('year',year);
regex = regex.replace('sem',sem);
console.log(regex)
// here the output is = /II B.Tech I Sem/g
regex = new RegExp(regex);
console.log(regex)
// here the regex changes and the output = /\/II B.Tech I Sem\/g/

Posted 9-Mar-21 5:42am

karthik2265

Updated 10-Mar-21 3:51am

Maciej Los

v2

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NotTodayYo 9-Mar-21 14:22pm

OK, where are you stuck?

You're already using variables.

1 solution

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Richard Deeming · Answer 1 · 2021-03-10T03:51:00

Simple:

JavaScript

let year = 'II';
let sem = 'I';
let regex = new RegExp(`${year} B.Tech ${sem} Sem`, "g");

You need to pass the options to the RegExp constructor, and remove the regex literal delimiters from your string.

RegExp - JavaScript | MDN[^]
Template literals (Template strings) - JavaScript | MDN[^]

How do I add variables in regex in javascript

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How do I add variables in regex in javascript

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