Regex for replacing {{}} with {{{}}} conditionaly

August 19, 2022

In a large String, some words wrap by {{ }} in three ways:

 1. {{some words}}
 2. {{#some words}}
 3. {{/some words}}

I need a regex that just converts {{some words}} to {{{some words}}}. Is there any solution?

>Solution :

If I understand correctly you want to exclude some {{ }} patterns from adding these extra braces.

You can use [^#/] to match any character that is not # and / and use that in the overal regular expression:

let text = "{{hello}} {{#hello}} {{/hello}} {{world}} {{#world}} {{/world}}";
let result = text.replace(/\{\{[^#/].*?}}/g, "{$&}");
console.log(result);

.*? matches any character (except newline) in a lazy manner, i.e. it will stop matching when }} is encountered.
$& represents the complete matched string