JS Practice — Built-in Objects

String.prototype.match() — basic regex match

📖 Usage Example

'test 123 foo'.match(/d+/)    // → ['123', index: 5, ...]
'test 1 and 2'.match(/d+/g)  // → ['1', '2']

Use match() to search a string against a regex and return the match results, or null if not found.

String.prototype.match()

str.match(regexp) returns an array with the match information when found, or null when not found.

Without the g flag, it returns the first match plus capture groups.

Challenge: Implement matchDigits(str) that returns the first sequence of digits in str using /\d+/.

matchDigits('abc123def') // → '123'
matchDigits('no digits') // → null

💡 Hints (2)