Setup string and regular expression for a multibyte regular expression match

# mb_ereg_search_init

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

mb_ereg_search_init — Setup string and regular expression for a multibyte regular expression match

### 说明

function mb_ereg_search_init(string `$string`, ?string `$pattern` = `null`, ?string `$options` = `null`): bool

mb_ereg_search_init() sets `string` and `pattern` for a multibyte regular expression. These values are used for mb_ereg_search(), mb_ereg_search_pos(), and mb_ereg_search_regs().

### 参数

`string`

  The search string.

`pattern`

  The search pattern.

`options`

  The search option. See mb_regex_set_options() for explanation.

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

### 更新日志

版本 | 说明
--- | ---
8.0.0 | `pattern` and `options` are nullable now.

### 注释

> 注意: mb_regex_encoding() 指定的内部编码或字符编码将会当作此函数用的字符编码。

### 参见

- mb_regex_encoding() - Set/Get character encoding for multibyte regex
- mb_ereg_search_regs() - Returns the matched part of a multibyte regular expression

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