mb_regex_set_options()

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

Set/Get the default options for mbregex functions

说明

mb_regex_set_options([string $options= mb_regex_set_options()]): string

Sets the default options described by$optionsfor 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
i	Ambiguity match on
x	Enables extended pattern form
m	'.'matches with newlines
s	'^'->'A','$'->'Z'
p	Same as both themandsoptions
l	Finds longest matches
n	Ignores empty matches
e	eval() resulting code

Regex syntax modes

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$optionsis omitted, it returns the string that describes the current options.

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

It's a bit trickier, than patryk wrote:
There are parameters (you can specify several of these at the same time):
'i': ONIG_OPTION_IGNORECASE;
'x': ONIG_OPTION_EXTEND;
'm': ONIG_OPTION_MULTILINE;
's': ONIG_OPTION_SINGLELINE;
'p': ONIG_OPTION_MULTILINE | ONIG_OPTION_SINGLELINE;
'l': ONIG_OPTION_FIND_LONGEST;
'n': ONIG_OPTION_FIND_NOT_EMPTY;
'e': eval() resulting code
And there are "modes" (if you specify several of these, the LAST one will be used):
'j': ONIG_SYNTAX_JAVA;
'u': ONIG_SYNTAX_GNU_REGEX;
'g': ONIG_SYNTAX_GREP;
'c': ONIG_SYNTAX_EMACS;
'r': ONIG_SYNTAX_RUBY;
'z': ONIG_SYNTAX_PERL;
'b': ONIG_SYNTAX_POSIX_BASIC;
'd': ONIG_SYNTAX_POSIX_EXTENDED;
You can find descriptions of these constants here: http://www.geocities.jp/kosako3/oniguruma/doc/API.txt

Supported options are:
i - ONIG_OPTION_IGNORECASE
x - ONIG_OPTION_EXTEND
m - ONIG_OPTION_MULTILINE
s - ONIG_OPTION_SINGLELINE
p - ONIG_OPTION_MULTILINE | ONIG_OPTION_SINGLELINE
l - ONIG_OPTION_FIND_LONGEST
n - ONIG_OPTION_FIND_NOT_EMPTY
j - ONIG_SYNTAX_JAVA
u - ONIG_SYNTAX_GNU_REGEX
g - ONIG_SYNTAX_GREP
c - ONIG_SYNTAX_EMACS
r - ONIG_SYNTAX_RUBY
z - ONIG_SYNTAX_PERL
b - ONIG_SYNTAX_POSIX_BASIC
d - ONIG_SYNTAX_POSIX_EXTENDED
e - eval() resulting code
Constants above are from Oniguruma regexp library, which is used internally. Default value for PHP 5.2.x is 'pr'.