Regular expression non-capture groups

Regular expressions in JavaScript have "non-capture groups" to allow for a quantifier to be expressed as a group but have the group omitted from the results. The syntax is ?: at the beginning of the group:

const string = 'ABC';
console.log(/A(?:B)([A-Z])/.exec(string));
// => [ 'ABC', 'C', index: 0, input: 'ABC', groups: undefined ]

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