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    mb_ereg_replace

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

    mb_ereg_replace — Replace regular expression with multibyte support

    Descrierea

    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

    Parametri

    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.

    Valorile întoarse

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

    Istoricul schimbărilor

    Versiune Descriere
    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.

    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.

    Avertizare

    Niciodată nu utilizați modificatorul e când lucrați cu date introduse ce nu provin din surse de încredere. Nu va avea loc evadarea automată (cum este cazul la preg_replace()). Ignorarea acestui fapt va crea probabil vulnerabilități de executare a codului la distanță în aplicația dumneavoastră.

    A se vedea și

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    User Contributed Notes 17 notes

    up
    124
    Pluche
    13 years ago
    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); ?>
    up
    20
    daemoneye at gmail dot com
    15 years ago
    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.
    up
    10
    trng
    13 years ago
    You can use \\n for capture group in replacement.
    And you can NOT use $n notation (unlike preg_replace function).
    up
    13
    Anonymous
    8 years ago
    Pluche's comment should REALLY be added to the documentation, preferably under the "$pattern" param description. It is crucial to using this function.
    up
    6
    keizo at gomo dot jp
    16 years ago
    <?php
    $pattern     = "([あ-ん]+)[0-9]+";
    $string = mb_ereg_replace($pattern, '「\\1」:\\0', $string);
    ?>

    you can use \\n for capture group in replacement
    up
    1
    Alexey Khrulev
    7 years ago
    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);
    ?>
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    1
    faxe at neostrada dot pl
    19 years ago
    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]
    up
    2
    Anonymous
    2 years ago
    Notations to reference captures in the replacement string:

    <?php

    // (1) \\number notation: (1 to 9, not greater than 9)
    echo mb_ereg_replace('(\S*) (\S*) (\S*)', '\\1 jam, \\2 juice, \\3 squash', 'apple orange lemon').'<br>'; // apple jam, orange juice, lemon squash

    // (2) \k<number> notation: (also greater than 9) (also as \k'number')
    echo mb_ereg_replace('(\S*) (\S*) (\S*)', '\k<1> jam, \k<2> juice, \k<3> squash', 'apple orange lemon').'<br>'; // (same as above)

    // (3) \k<word> notation: (also as \k'word')
    echo mb_ereg_replace('(?<word1>\S*) (?<word2>\S*) (?<word3>\S*)', '\k<word1> jam, \k<word2> juice, \k<word3> squash', 'apple orange lemon').'<br>'; // (same as above)

    // Note non-named-subpatterns like "(\S*)" should not be used with named-subpatterns like "(?<word>..)" because non-named-subpatterns cannot be captured when named-subpatterns exist.
    up
    -1
    j-fr dot fortier at wanadoo dot fr
    5 years ago
    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 -éèàîïùç...- chars with ascii chars):
    <?php
    $transliterator     = Transliterator::create("NFD; [:Nonspacing Mark:] Remove; NFC;");
    echo     $transliterator->transliterate("Héhé, ça 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, ça marche !"), '-');
    ?>
    // Result : « hehe-ca-marche »
    up
    1
    vondrej(at)gmail(dot)com
    18 years ago
    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;
    }
    ?>
    up
    0
    Anonymous
    18 years ago
    '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.
    up
    -2
    gmx dot net at ulrich dot mierendorff
    16 years ago
    If you want to replace characters like "ä" or "ø" you can use mb_ereg_replace, but it is very slow. str_replace is much faster and also works with characters like "ä" or "ø"!

    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.
    up
    -1
    marco at thenetworksolution dot it
    10 years ago
    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;
    }
    up
    -1
    squeegee
    18 years ago
    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.
    up
    -1
    mpnicholas [@t] gmail (dot) com
    18 years ago
    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.
    up
    -4
    marco at thenetworksolution dot it
    10 years ago
    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
    up
    -4
    ms2705335 at gmail dot com
    7 years ago
    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';
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