Match and replace regex with modified regex in JS

Question

Currently I'm going through a string like so:

'@test1 in else',
'@test2 in something',

and look only for

test1
test2

my goal is to have end result of string to look like this:

'([@test1])(test1) in else',
'((@test2))(test2) in something',

This is what I do but clearly it doesn't work:

fileData.replace(/@(\w)+/g, '([' + /@(\w)+/g + '](' + /@(\w)+/g) + ')')

I don't understand how can I save the regex that I found and use it in modified version

You would use $1, $2 and so on... take a look at the documentation at MDN: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — Haroldo_OK
– Haroldo_OK, Commented Sep 8, 2022 at 10:05

anubhava · Accepted Answer · 2022-09-08 10:05:25Z

2

You can use this code:

const str = `'@test1 in else',
'@test2 in something',`;
var repl = str.replace(/@(\w+)/g, '([@$1])($1)');

console.log(repl);

Breakup:

@(\w+): Match a text starting with @ followed by 1+ word charts and capture word chars in capture group #1
([@$1])($1): Replacement part to place capture text in wrapper brackets twice

answered Sep 8, 2022 at 10:05

anubhava

790k67 gold badges603 silver badges671 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1