如何 preg_match_all 德国变音符号 [äöü]？

Question

如果文本有德语变音符号 [äöü] preg_match_all 的结果有错误的偏移量（似乎每个变音符号都将偏移量扩展 1）

我需要每个单词的位置，因为它们会被其他字符串替换。使用此工具 https://regex101.com/r/UosqVD/2 它有效，匹配具有正确的起始值。

$pattern = "~\b\w+\b~u";
$text = "Käthe würde gerne wählen.";
if (preg_match_all($pattern, $text, $matches, PREG_OFFSET_CAPTURE)) {
    foreach ($matches[0] as $m) {
        echo $m[0]."; ".$m[1]."; ".mb_strlen($m[0], "utf-8")."<br />";
    }
}

Text; Start, Length<br>
Käthe; 0; 5<br>
würde; 7; 5<br>
gerne; 14; 5<br>
wählen; 20; 6<br>

Answer 1

PHP documentation 包含用户编写的函数 mb_preg_match_all()，似乎符合您的需要：

function mb_preg_match_all($ps_pattern, $ps_subject, &$pa_matches, $pn_flags = PREG_PATTERN_ORDER, $pn_offset = 0, $ps_encoding = NULL) {
    // WARNING! - All this function does is to correct offsets, nothing else:
    //
    if (is_null($ps_encoding))
        $ps_encoding = mb_internal_encoding();

    $pn_offset = strlen(mb_substr($ps_subject, 0, $pn_offset, $ps_encoding));
    $ret = preg_match_all($ps_pattern, $ps_subject, $pa_matches, $pn_flags, $pn_offset);

    if ($ret && ($pn_flags & PREG_OFFSET_CAPTURE))
        foreach($pa_matches as &$ha_match)
            foreach($ha_match as &$ha_match)
                $ha_match[1] = mb_strlen(substr($ps_subject, 0, $ha_match[1]), $ps_encoding);
        //
        // (code is independent of PREG_PATTER_ORDER / PREG_SET_ORDER)

    return $ret;
}

如何 preg_match_all 德国变音符号 [äöü]？

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php

regex

unicode

preg-match

preg-match-all