TypeScript String matchAll() Method

In TypeScript, the matchAll() method of String values returns an iterator of all results matching the string against a regular expression, including capturing groups. The matchAll() method is quite similar to the match() method, but match() returns only the first match and it doesn’t include capturing groups.

Syntax:

string.matchAll(regexp: RegExp): RegExpMatchArrayIterator

Return Value: Returns a RegExpMatchArrayIterator object, an iterator that yields RegExpMatchArray objects (arrays representing individual matches).

Example 1: To demonstrate getting an email from the given string using the matchAll() method.

Javascript

let text: string =
    "Please contact us at support@geeksforgeeks.org or at courses@geeksforgeeks.org";
let emailRegex = /\b[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}\b/g;
let emails = text.matchAll(emailRegex);

for (const match of emails) {
  console.log("Found email address:", match[0]);
}

Output:

Found email address: support@geeksforgeeks.org
Found email address: courses@geeksforgeeks.org

Example 2: To demonstrate getting product IDs from given string using matchAll() method.

Javascript

let descriptions: string[] = [
  "Product 123 (ABC-DEF) is the best!",
  "Buy Product ID 456 now!",
  "This is not a product description.",
];

const idRegex = /\bProduct\s+(\d+)\b|\bID\s+(\w+)\b/g;

for (const description of descriptions) {
  const matches = description.matchAll(idRegex);

  for (const match of matches) {
    console.log("Product ID:", match[1] || match[2]);
  }
}

Output:

Product ID: 123
Product ID: 456