mb_regex_set_options

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

mb_regex_set_options — Set/Get the default options for mbregex functions

说明

mb_regex_set_options(?string $options = null): string

Sets the default options described by options for multibyte regex functions.

参数

options

The options to set. This is a string where each character is an option. To set a mode, the mode character must be the last one set, however there can only be set one mode but multiple options.

**Regex options**
Option	Meaning	更新日志
i	Ambiguity match on
x	Enables extended pattern form
m	`'.'` matches with newlines
s	`'^'` -> `'\A'`, `'$'` -> `'\Z'`
p	Same as both the `m` and `s` options
l	Finds longest matches
n	Ignores empty matches
e	eval() resulting code	Deprecated as of PHP 7.1.0 and removed as of PHP 8.0.0

注意:
The "e" option has no effect when set through mb_regex_set_options(). Use it with mb_ereg_replace() or mb_eregi_replace().

**Regex syntax modes (only one may be set)**
Mode	Meaning
j	Java (Sun java.util.regex)
u	GNU regex
g	grep
c	Emacs
r	Ruby
z	Perl
b	POSIX Basic regex
d	POSIX Extended regex

返回值

The previous options. If options is omitted or null, it returns the string that describes the current options.

更新日志

版本	说明
8.0.0	If the parameter `options` is given and not `null`, the previous options are returned. Formerly, the current options have been returned.
8.0.0	`options` is nullable now.
8.0.0	The `"e"` option now throws a ValueError.
7.1.0	The `"e"` option now emits an `E_DEPRECATED`.

参见

mb_split() - 使用正则表达式分割多字节字符串
mb_ereg() - Regular expression match with multibyte support
mb_eregi() - Regular expression match ignoring case with multibyte support