JS Practice — Built-in Objects

String.prototype.search() — case-insensitive with /i

📖 Usage Example

'hello world'.search(/world/)   // → 6
'hello'.search(/d/)           // → -1
'abc123'.search(/[0-9]/)       // → 3

Use search() to find the index of the first regex match in a string, returning -1 if not found.

String.prototype.search() — Case-Insensitive

Add the i flag to make the search case-insensitive.

Challenge: Implement findWordIndex(str, word) that returns the index of word (case-insensitive).

findWordIndex('Hello World', 'world') // → 6
findWordIndex('Hello World', 'HELLO') // → 0

💡 Hints (1)