What is the method to access captured groups in a JavaScript regular expression

Question

With the help of code, can you tell me what the method is to access captured groups in a regular JavaScript expression?

Answer 1

ou can access captured groups from a regular expression match using several methods:

Using String.prototype.match():

The match() method retrieves the result of matching a string against a regular expression. Without the global (g) flag, it returns an array similar to exec().

Example:

const regex = /(\w+) (\w+)/;

const str = 'John Doe';

const result = str.match(regex);

console.log(result[0]); // 'John Doe' (full match)

console.log(result[1]); // 'John' (first captured group)

console.log(result[2]); // 'Doe' (second captured group)

Using String.prototype.matchAll():

The matchAll() method returns an iterator of all results matching a string against a regular expression, including capturing groups. This is particularly useful when using the global (g) flag.

Example:

const regex = /(\w+) (\w+)/g;

const str = 'John Doe Jane Smith';

const matches = str.matchAll(regex);

for (const match of matches) {

  console.log(match[0]); // Full match

  console.log(match[1]); // First captured group

  console.log(match[2]); // Second captured group

}