JS Practice — Built-in Objects

String.prototype.matchAll() — access capture groups

📖 Usage Example

const str = 'a1 b2 c3'
const matches = [...str.matchAll(/(w)(d)/g)]
matches.length   // → 3
matches[0][1]    // → 'a'

Use matchAll() with the g flag to iterate over all regex matches and access capture groups in each result.

String.prototype.matchAll() — Capture Groups

Each match result in matchAll is a full match object with capture groups at indices 1, 2, etc.

Challenge: Implement extractNumbers(str) that returns all digit sequences as numbers.

extractNumbers('price: 42 and 100') // → [42, 100]

💡 Hints (1)