Separate bracket in js regx

Question

How do we write expressions to add a space between bracket in js
For example,
‘Avc[1234]’
How to make it ‘Avc [1234]’

Answer 1

Most straightforward way would probably be

"Avc[123]".replace("[", " ["))

i'm not a regex expert but there are probably more "correct" ways....😅

Answer 2

If you want it to replace all occuurences (in case there are more than one) then do this using global flag

"Avc[123] and Avc[455]".replace(/\[/g, " [")

Answer 3

const regex = /(\w)([ ]*)(\[\d+])/gm;
const str = `avc[123]
avc [123]
avc [123]
avc [123]
avcd[12345]
[123]
avc[123
avc123
avc`;
const subst = `$1 $3`;

// The substituted value will be contained in the result variable
const result = str.replace(regex, subst);

console.log('Substitution result: ', result);

More info
https://regex101.com/r/k8XD9D/2