International PHP Conference Munich 2021

mb_ereg

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

mb_eregRegular expression match with multibyte support

Descrierea

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

Executes the regular expression match with multibyte support.

Parametri

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.

Valorile întoarse

Returns whether pattern matches string.

Istoricul schimbărilor

Versiune Descriere
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.

Note

Notă:

Codificarea internă a caracterelor sau codificarea caracterelor specificată de funcția mb_regex_encoding() va fi utilizată în calitate de codificare a caracterelor pentru această funcție.

A se vedea și

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

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User Contributed Notes 8 notes

up
5
Anonymous
4 years ago
Old link to Oniguruma regex syntax is not working anymore, there is a working one:
https://github.com/geoffgarside/oniguruma/blob/master/Syntax.txt
up
2
pressler at hotmail dot de
8 years ago
Note that mb_ereg() does not support the \uFFFF unicode syntax but uses \x{FFFF} instead:

<?PHP

$text
= 'Peter is a boy.'; // english
$text = 'بيتر هو صبي.'; // arabic
//$text = 'פיטר הוא ילד.'; // hebrew

mb_regex_encoding('UTF-8');

if(
mb_ereg('[\x{0600}-\x{06FF}]', $text)) // arabic range
//if(mb_ereg('[\x{0590}-\x{05FF}]', $text)) // hebrew range
{
    echo
"Text has some arabic/hebrew characters.";
}
else
{
    echo
"Text doesnt have arabic/hebrew characters.";
}

?>
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1
lastuser at example dot com
3 years ago
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 - .
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0
Anonymous
6 months ago
<?php

# What mb_ereg() returns & changes $_3rd_argument into
# (Just run this script)

function dump2str($var) {
   
ob_start();
   
var_dump($var);
   
$output = ob_get_contents();
   
ob_end_clean();
    return
$output;
}

# (PHP7)empty pattern returns bool(false) with Warning
# (PHP8)empty pattern throws ValueError
   
$emp_ptn = '';
try{
   
$emp_ptn.=  dump2str(mb_ereg('', 'abcde'));
}catch(
Exception | Error $e){
   
$emp_ptn.=  get_class($e).'<br>';
   
$emp_ptn.=  $e->getMessage();
   
$emp_ptn.=  '<pre>'.$e->getTraceAsString().'</pre>';
}

echo
'PHP '.phpversion().'<br><br>'.

'# match<br>'.
dump2str(mb_ereg("bcd", "abcde")).
' : mb_ereg("bcd", "abcde")<br><br>'.

'# match with 3rd argument<br>'.
dump2str(mb_ereg("bcd", "abcde", $_3rd)).
' : mb_ereg("bcd", "abcde", $_3rd)    // '.dump2str($_3rd).'<br><br>'.

'# match (0 byte)<br>'.
dump2str(mb_ereg("^", "abcde")).
' : mb_ereg("^", "abcde")<br><br>'.

'# match (0 byte) with 3rd argument<br>'.
dump2str(mb_ereg("^", "abcde", $_3rd)).
' : mb_ereg("^", "abcde", $_3rd)    // '.dump2str($_3rd).'<br><br>'.

'# unmatch<br>'.
dump2str(mb_ereg("f", "abcde")).
' : mb_ereg("f", "abcde")<br><br>'.

'# unmatch with 3rd argument<br>'.
dump2str(mb_ereg("f", "abcde", $_3rd)).
' : mb_ereg("f", "abcde", $_3rd)    // '.dump2str($_3rd).'<br><br>'.

'# empty pattern<br>'.
$emp_ptn.
' : mb_ereg("", "abcde")<br><br>'.

'# empty pattern with 3rd argument<br>'.
$emp_ptn.
' : mb_ereg("", "abcde", $_3rd)    // '.dump2str($_3rd).'<br><br>';

?>
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0
Anonymous
2 years ago
<?php

// in PHP_VERSION 7.1

// WITHOUT $regs (3rd argument)
$int = mb_ereg('abcde', '_abcde_'); // [5 bytes match]
var_dump($int);                     // int(1)

$int = mb_ereg('ab', '_ab_');       // [2 bytes match]
var_dump($int);                     // int(1)

$int = mb_ereg('^', '_ab_');        // [0 bytes match]
var_dump($int);                     // int(1)

$int = mb_ereg('ab', '__');         // [not match]
var_dump($int);                     // bool(false)

$int = mb_ereg('', '_ab_');         // [error : empty pattern]
                                    // Warning: mb_ereg(): empty pattern in ...
var_dump($int);                     // bool(false)

$int = mb_ereg('ab');               // [error : fewer arguments]
                                    // Warning: mb_ereg() expects at least 2 parameters, 1 given in ...
var_dump($int);                     // bool(false)

                    // Without 3rd argument, mb_ereg() returns either int(1) or bool(false).

// WITH $regs (3rd argument)
$int = mb_ereg('abcde', '_abcde_', $regs);// [5 bytes match]
var_dump($int);                           // int(5)
var_dump($regs);                          // array(1) { [0]=> string(5) "abcde" }

$int = mb_ereg('ab', '_ab_', $regs);      // [2 bytes match]
var_dump($int);                           // int(2)
var_dump($regs);                          // array(1) { [0]=> string(2) "ab" }

$int = mb_ereg('^', '_ab_', $regs);       // [0 bytes match]
var_dump($int);                           // int(1)
var_dump($regs);                          // array(1) { [0]=> bool(false) }

$int = mb_ereg('ab', '__', $regs);        // [not match]
var_dump($int);                           // bool(false)
var_dump($regs);                          // array(0) { }

$int = mb_ereg('', '_ab_', $regs);        // [error : empty pattern]
                                          // Warning: mb_ereg(): empty pattern in ...
var_dump($int);                           // bool(false)
var_dump($regs);                          // array(0) { }

$int = mb_ereg('ab');                     // [error : fewer arguments]
                                          // Warning: mb_ereg() expects at least 2 parameters, 1 given in ...
var_dump($int);                           // bool(false)
var_dump($regs);                          // array(0) { }

                    // With 3rd argument, mb_ereg() returns either int(how many bytes matched) or bool(false)
                    // and 3rd argument is a bit complicated.

?>
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0
mb_ereg() seems unable to Use &#34;named sub
6 years ago
mb_ereg() seems unable to Use "named subpattern".
preg_match() seems a substitute only in UTF-8 encoding.

<?php

$text
= 'multi_byte_string';
$pattern = '.*(?<name>string).*';        // "?P" causes "mbregex compile err" in PHP 5.3.5

if(mb_ereg($pattern, $text, $matches)){
    echo
'<pre>'.print_r($matches, true).'</pre>';
}else{
    echo
'no match';
}

?>

This code ignores "?<name>" in $pattern and displays below.

Array
(
    [0] => multi_byte_string
    [1] => string
)

$pattern = '/.*(?<name>string).*/u';
if(preg_match($pattern, $text, $matches)){

instead of lines 2 & 3
displays below (in UTF-8 encoding).

Array
(
    [0] => multi_byte_string
    [name] => string
    [1] => string
)
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-1
Riikka K
6 years ago
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
up
-2
Jon
12 years ago
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).

<?php
echo "Line ";
//mb_regex_encoding("ISO-8859-8");
//if(mb_ereg(".*([\u05d0-\u05ea]).*", $this->current_line))
if(mb_ereg(".*([א-ת]).*", $this->current_line))
{
    echo
"has";
}
else
{
    echo
"doesn't have";
}
echo
" Hebrew characters.<br>";   
//mb_regex_encoding("UTF-8");
?>
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