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+---
+Title: 'matchAll()'
+Description: 'Returns an iterator of all results matching a regular expression in a string, including capturing groups.'
+Subjects:
+  - 'Code Foundations'
+  - 'Computer Science'
+Tags:
+  - 'Iterators'
+  - 'Methods'
+  - 'Strings'
+CatalogContent:
+  - 'learn-javascript'
+  - 'paths/full-stack-engineer'
+---
+
+The **`matchAll()`** method is a built-in JavaScript function that returns an [iterator](https://www.codecademy.com/resources/docs/javascript/iterators) of all matches of a [regular expression](https://www.codecademy.com/resources/docs/general/regular-expressions) within a string. It provides detailed match results, including capturing groups and match indices.
+
+## Syntax
+
+```pseudo
+str.matchAll(regexp)
+```
+
+**Parameters:**
+
+- `regexp`: A regular expression object with the global (`g`) flag. If the `g` flag is not present, a `TypeError` is thrown.
+
+**Return value:**
+
+An iterator of match result objects, each containing:
+
+- the full matched substring
+- any capturing groups
+- the index of the match
+- the input string
+
+## Example
+
+In this example, `matchAll()` retrieves all regex matches from the string `'test1 test2'`, providing access to full matches and captured groups as part of a match array:
+
+```js
+const text = 'test1 test2';
+const regex = /t(e)(st(\d?))/g;
+
+const matches = Array.from(text.matchAll(regex));
+console.log(matches[0]);
+
+console.log(matches[1][0]);
+```
+
+The output of this code will be:
+
+```shell
+[
+  'test1',
+  'e',
+  'st1',
+  '1',
+  index: 0,
+  input: 'test1 test2',
+  groups: undefined
+]
+test2
+```
+
+## Codebyte Example
+
+In this example, `matchAll()` is used in a loop to find all words ending in `'at'` and log their values along with their starting indices:
+
+```codebyte/javascript
+const string = "cat bat rat";
+const regex = /(\w+)at/g;
+
+for (const match of string.matchAll(regex)) {
+  console.log(`Found '${match[0]}' at index ${match.index}.`);
+}
+```