javascript - About match()

Question

alert('rgb(255)'.match(/rgb\((\d )\)/));

Looking for matches. I don’t understand why ["rgb(255)", "255"] is returned?

Why not just return "rgb(255)"

Answer 1

Because you used capture, that is, the brackets.

console.log('rgb(255)'.match(/rgb\((\d+)\)/));

No need to capture it

console.log('rgb(255)'.match(/rgb\(\d+\)/));

Answer 2

For this kind of problem, please refer to the document directly: String.prototype.match()