Regular expression match with multibyte support

# mb_ereg

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

mb_ereg — Regular expression match with multibyte support

### Description

mb_ereg(string `$pattern`, string `$string`, array `&$matches` = `null`): bool

Executes the regular expression match with multibyte support.

### Parameters

`pattern`

  The search pattern.

`string`

  The search string.

`matches`

  If matches are found for parenthesized substrings of `pattern` and the function is called with the third argument `matches`, the matches will be stored in the elements of the array `matches`. If no matches are found, `matches` is set to an empty array.

  $matches[1] will contain the substring which starts at the first left parenthesis; $matches[2] will contain the substring starting at the second, and so on. $matches[0] will contain a copy of the complete string matched.

### Return Values

Returns whether `pattern` matches `string`.

### Changelog

Version | Description
--- | ---
8.0.0 | This function returns `true` on success now. Previously, it returned the byte length of the matched string if a match for `pattern` was found in `string` and `matches` was passed. If the optional parameter `matches` was not passed or the length of the matched string was `0`, this function returned `1`.
7.1.0 | mb_ereg() will now set `matches` to an empty array, if nothing matched. Formerly, `matches` was not modified in that case.

### Notes

> Note:

> The internal encoding or the character encoding specified by mb_regex_encoding() will be used as the character encoding for this function.

### See Also

- mb_regex_encoding() - Set/Get character encoding for multibyte regex
- mb_eregi() - Regular expression match ignoring case with multibyte support

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