Regex to match exact number of occurence

Question

How do I create a regex to exactly match {{ variable } and ignore the {{ variable }}.

this what I have

text.match(/{{[^}]+}/g

but it's also matching {{ variable }} instead of just {{ variable }.

Answer 1

If you want to detect {{ variable } as valid and ignore {{ variable }}

You have to verify the end of the string using $

Regex Needed /{{[^}]+}$/g

Explanation

Visulization

const input1 = "{{ variable }";
console.log(input1.match(/{{[^}]+}$/g));

const input2 = "{{ variable }}";
console.log(input2.match(/{{[^}]+}$/g));

EDIT

If you want to detect { variable }} as valid and ignore {{ variable }}

You have to verify the start of the string with ^, also you have to check for negative lookahead for {{ using (?!{{)

Regex Needed /(?!{{)^{[^}]+}}$/g

Explanation

Visulization

const input1 = "{ variable }}";
console.log(input1.match(/(?!{{)^{[^}]+}}$/g));

const input2 = "{{ variable }}";
console.log(input2.match(/(?!{{)^{[^}]+}}$/g));