mb_ereg()

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

Regular expression match with multibyte support

说明

Executes the regular expression match with multibyte support.

参数

The search pattern.

The search string.

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

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

返回值

Returns the byte length of the matched string if a match for$patternwas found in$string, or FALSE if no matches were found or an error occurred.

If the optional parameter$regswas not passed or the length of the matched string is0, this function returns1.

更新日志

注释

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_eregi()Regular expression match ignoring case with multibyte support

Old link to Oniguruma regex syntax is not working anymore, there is a working one:
https://github.com/geoffgarside/oniguruma/blob/master/Syntax.txt

Note that mb_ereg() does not support the \uFFFF unicode syntax but uses \x{FFFF} instead: 

I hope this information is shown somewhere on php.net.
According to "https://github.com/php/php-src/tree/PHP-5.6/ext/mbstring/oniguruma",
the bundled Oniguruma regex library version seems ...
 4.7.1 between PHP 5.3 - 5.4.45,
 5.9.2 between PHP 5.5 - 7.1.16,
 6.3.0 since PHP 7.2 - .

mb_ereg() seems unable to Use "named subpattern".
preg_match() seems a substitute only in UTF-8 encoding.

This code ignores "?" in $pattern and displays below.
Array
(
  [0] => multi_byte_string
  [1] => string
)
$pattern = '/.*(?string).*/u';
if(preg_match($pattern, $text, $matches)){
instead of lines 2 & 3
displays below (in UTF-8 encoding).
Array
(
  [0] => multi_byte_string
  [name] => string
  [1] => string
)

While hardly mentioned anywhere, it may be useful to note that mb_ereg uses Oniguruma library internally. The syntax for the default mode (ruby) is described here:
http://www.geocities.jp/kosako3/oniguruma/doc/RE.txt

Hebrew regex tested on PHP 5, Ubuntu 8.04.
Seems to work fine without the mb_regex_encoding lines (commented out).
Didn't seem to work with \uxxxx (also commented out).

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