mb_ereg_replace

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

mb_ereg_replace — Replace regular expression with multibyte support

说明

mb_ereg_replace ( string $pattern , string $replacement , string $string , string|null $options = null ) : string|false|null

Scans string for matches to pattern, then replaces the matched text with replacement

参数

pattern

The regular expression pattern.

Multibyte characters may be used in pattern.

replacement

The replacement text.

string

The string being checked.

options

The search option. See mb_regex_set_options() for explanation.

返回值

The resultant string on success, or false on error. If string is not valid for the current encoding, null is returned.

更新日志

版本	说明
8.0.0	`options` is nullable now.
7.1.0	The function checks whether `string` is valid for the current encoding.
7.1.0	The `e` modifier has been deprecated.

注释

Note:
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。

Warning

处理非信任的输入时从不使用 e 修饰符，就不会转码（即调用 preg_replace()）。不注意这些会很可能会导致应用程序引发远程代码执行的漏洞。

参见

mb_regex_encoding() - Set/Get character encoding for multibyte regex
mb_eregi_replace() - Replace regular expression with multibyte support ignoring case

User Contributed Notes

j-fr dot fortier at wanadoo dot fr 07-Feb-2019 04:56


Since PHP 5.4, to make uppercase ou lowercase characters, or rewrite some uris, without to take care about initial encoding, the transliteration is easier (and probably the best way): see http://php.net/manual/fr/transliterator.transliterate.php and http://userguide.icu-project.org/transforms/general



For example (with create) (french text: replace all accuentued -éèà??ù?...- chars with ascii chars):

<?php

$transliterator = Transliterator::create("NFD; [:Nonspacing Mark:] Remove; NFC;");

echo $transliterator->transliterate("Héhé, ?a marche !");

?>

// Result: ? Hehe, ca marche ! ?



To rewrite a phrase in URI (with createFromRules):

<?php

$transliterator = Transliterator::createFromRules("::Latin-ASCII; ::Lower; [^[:L:][:N:]]+ > '-';");

echo trim($transliterator->transliterate("Héhé, ?a marche !"), '-');

?>

// Result : ? hehe-ca-marche ?

Alexey Khrulev 31-Aug-2017 10:10


If encoding of PHP script differs from encoding of string to be processed by mb_ereg_replace(), then you can't just write pattern in script. Both $pattern and $replacement must be converted to same encoding as string to be processed. In this example script is in UTF-8, file to be processed is in UTF-16LE encoding:



<?php

$file_encoding = 'UTF-16LE';

mb_regex_encoding( $file_encoding );



$pattern     = "aaa";

$replacement = "AAA";

$pattern_encoded     = mb_convert_encoding( $pattern,     $file_encoding, 'UTF-8' );

$replacement_encoded = mb_convert_encoding( $replacement, $file_encoding, 'UTF-8' );



$result = mb_ereg_replace( $pattern_encoded, $replacement_encoded, file_get_contents('UTF-16LE.txt') );

file_put_contents('UTF-16LE-updated.txt', $result);

?>

ms2705335 at gmail dot com 17-Jul-2017 10:10


As trng mentioned before you can use \\n for replacement but NOT \\\\n as mentioned in preg_replace docs. So string definition will be like:

$str = '\\1';

Anonymous 19-Jan-2016 11:23


Pluche's comment should REALLY be added to the documentation, preferably under the "$pattern" param description. It is crucial to using this function.

marco at thenetworksolution dot it 03-Feb-2014 02:47


To selectively uppercase parts of a string via mb_eregi_replace



    $str = mb_eregi_replace('\b([0-9]{1,4}[a-z]{1,2})\b', "strtoupper

('\\1')", $str, 'e');



Full example, how to fix an address manually typed, uppercasing the first letter of a words and keeping uppercase roman numerals and the letters A,B,C after the house number):



function ucAddress($str) {

// first lowercase all and use the default ucwords

    $str = ucwords(strtolower($str));

// let's fix the default ucwords...

// uppercase letters after house number (was lowercased by the strtolower above)

    $str = mb_eregi_replace('\b([0-9]{1,4}[a-z]{1,2})\b', "strtoupper

('\\1')", $str, 'e');

// the same for roman numerals

    $str = mb_eregi_replace('\bM{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})\b', "strtoupper('\\0')", $str, 'e');

    return $str;

}



Dr. Marco Marsala

Network Solution srl

http://www.realizzazionesitigenova.it

marco at thenetworksolution dot it 03-Feb-2014 02:47


To selectively uppercase parts of a string via mb_eregi_replace



    $str = mb_eregi_replace('\b([0-9]{1,4}[a-z]{1,2})\b', "strtoupper

('\\1')", $str, 'e');



Full example, how to fix an address manually typed, uppercasing the first letter of a words and keeping uppercase roman numerals and the letters A,B,C after the house number):



function ucAddress($str) {

// first lowercase all and use the default ucwords

    $str = ucwords(strtolower($str));

// let's fix the default ucwords...

// uppercase letters after house number (was lowercased by the strtolower above)

    $str = mb_eregi_replace('\b([0-9]{1,4}[a-z]{1,2})\b', "strtoupper

('\\1')", $str, 'e');

// the same for roman numerals

    $str = mb_eregi_replace('\bM{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})\b', "strtoupper('\\0')", $str, 'e');

    return $str;

}

trng 15-Jun-2011 09:22


You can use \\n for capture group in replacement.

And you can NOT use $n notation (unlike preg_replace function).

Pluche 30-Dec-2010 04:17


Unlike preg_replace, mb_ereg_replace doesn't use separators





Exemple with preg_replace :


<?php $data = preg_replace("/[^A-Za-z0-9\.\-]/","",$data); ?>





Exemple with mb_ereg_replace :


<?php $data = mb_ereg_replace("[^A-Za-z0-9\.\-]","",$data); ?>

daemoneye at gmail dot com 03-Feb-2009 02:53


I got a pretty nasty error while trying to parse table rows(all contents were set to UTF-8) from the database for a dictionary project. The idea was to get all the rows from the first table (that is a table with bulgarian phrase in the first field, and its translation in english, french and german in the next fields). I needed to index all the bulgarian words that are found in the table to make an intelligent search. And that is where my headache started.



First of all, even with mb_strtolower() a lot of cyrillic characters went corrupted (ex: 'т,ъ,у,ф,б,г,з,ж,' etc...). After an hour of different attempts I got such a solution:



<?php



mb_internal_encoding("UTF-8");

mb_regex_encoding("UTF-8");



$rows = $db->getRows();



$contents = array();

foreach ($rows as $eachRow)

{

    $cleared = str_replace($commonWords, ' ', mb_strtolower(stripslashes($eachRow['bulgarian']), 'UTF-8' ));

    if (trim($cleared) != '') $contents[] = trim($cleared);

}    



$list = array();

foreach ($contents as $eachRow)

{

    $exploded = explode(' ', $eachRow);

    foreach ($exploded as $eachExpl)

    {

        $eachExpl = mb_ereg_replace('[^а-я ]',' ', $eachExpl);

        if (trim($eachExpl) != '') 

            if (!in_array($eachExpl, $list, true))    $list[] = trim($eachExpl);

    }

}



?>



To work properly I got to set all the internal encoding settings to UTF-8. Else the default Latin-1 got half my database with missing characters.



I am posting this solution just in case someone has encountered a similar problem. Hope it helps you in case you need something like that.

keizo at gomo dot jp 23-Jul-2008 09:32


<?php


$pattern = "([あ-ん]+)[0-9]+";


$string = mb_ereg_replace($pattern, '「\\1」:\\0', $string);


?>





you can use \\n for capture group in replacement

gmx dot net at ulrich dot mierendorff 01-Jul-2008 07:39


If you want to replace characters like "?" or "?" you can use mb_ereg_replace, but it is very slow. str_replace is much faster and also works with characters like "?" or "?"!



I think this has something to with the fact that str_replace works on byte level and does not care about characters.

I hope that can help.

04-Dec-2006 08:36


'i' option does not work correctly with multibyte characters. The function does not locate/replace the multibyte string if it's different case then specified on multibyte needle which is in different case.

squeegee 01-Nov-2006 07:41


well, if you just calculated the length of the find and replace strings once instead of on every loop, it would likely speed it up a lot.

mpnicholas [@t] gmail (dot) com 09-Jul-2006 03:09


Regarding the mb_str_ireplace() function: I benchmarked it against mb_eregi_replace() for single-character substitution, and it was significantly slower. Despite avoiding the ereg call, I think the while loop ends slowing you down too much for this to be practical.

vondrej(at)gmail(dot)com 26-Feb-2006 03:47


Are you looking for htmlentities() for multibyte strings? This might help you - it just replace <, >, ", '





<?php


/**


 *  Multibyte equivalent for htmlentities() [lite version :)]


 *


 * @param string $str


 * @param string $encoding


 * @return string


 **/


function mb_htmlentities($str, $encoding = 'utf-8') {


    mb_regex_encoding($encoding);


    $pattern = array('<', '>', '"', '\'');


    $replacement = array('&lt;', '&gt;', '&quot;', '&#39;');


    for ($i=0; $i<sizeof($pattern); $i++) {


        $str = mb_ereg_replace($pattern[$i], $replacement[$i], $str);


    }


    return $str;


}


?>

faxe at neostrada dot pl 09-Aug-2005 03:52


A simple mb_str_ireplace() implementation - a faster (?) replacement for non-regexp multi-byte string replacement:





<?php


function mb_str_ireplace($co, $naCo, $wCzym)


{


    $wCzymM = mb_strtolower($wCzym);


    $coM    = mb_strtolower($co);


    $offset = 0;


    


        while(!is_bool($poz = mb_strpos($wCzymM, $coM, $offset)))


    {


        $offset = $poz + mb_strlen($naCo);


        $wCzym = mb_substr($wCzym, 0, $poz). $naCo .mb_substr($wCzym, $poz+mb_strlen($co));


        $wCzymM = mb_strtolower($wCzym);


    }


    


    return $wCzym;


}


?>





[thiago - EDITOR NOTE: This function has improvements from d-okumura [aat] fi{dot}kyd[dot]co.jp]