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如何正確使用mb_ereg_search_regs 函數來進行多字節字符的正則匹配操作？

gitbox 2025-08-26 
<span><span><span class="hljs-meta"><?php</span></span><span>
</span><span><span class="hljs-comment">// 文章開頭與正文無關的PHP代碼示例</span></span><span>
</span><span><span class="hljs-variable">$timestamp</span></span><span> = </span><span><span class="hljs-title function_ invoke__">time</span></span><span>();
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"當前時間戳為："</span></span><span> . </span><span><span class="hljs-variable">$timestamp</span></span><span>;
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<br>------------------------<br>"</span></span><span>;
</span><span><span class="hljs-meta">?></span></span><span>

<hr>

<h2>如何正確使用 <code>mb_ereg_search_regs

返回值是一個數組，包含當前匹配的所有子表達式。如果沒有匹配，返回FALSE 。

2 . 使用步驟
  1. 設置正則搜索的編碼模式： mb_regex_encoding('UTF-8');
  2. 初始化搜索： mb_ereg_search_init($string, $pattern);
  3. 獲取匹配結果： $matches = mb_ereg_search_regs();
  4. 可通過循環或mb_ereg_search()繼續查找下一次匹配。

3 . 示例代碼
<span><span class="function_ invoke__">mb_regex_encoding</span></span> <span>(</span> <span><span>&#39;UTF-8&#39;</span></span> <span>);

</span><span><span>$text</span></span> <span>=</span> <span><span>"PHP 正則表達式處理多字節字符示例"</span></span> <span>;
</span><span><span>$pattern</span></span> <span>=</span> <span><span>"多字節(字符)"</span></span> <span>;

</span><span><span class="function_ invoke__">mb_ereg_search_init</span></span> <span>(</span> <span><span>$text</span></span> <span>,</span> <span><span>$pattern</span></span> <span>);

</span><span><span>// 獲取第一次匹配結果</span></span><span>
</span><span><span>if</span></span> <span>(</span> <span><span>$match</span></span> <span>=</span> <span><span class="function_ invoke__">mb_ereg_search_regs</span></span> <span>()) {
    </span><span><span>echo</span></span><span> </span><span><span>"匹配成功：<br> "</span></span> <span>;
    </span><span><span class="function_ invoke__">print_r</span></span> <span>(</span> <span><span>$match</span></span> <span>);
}</span> <span><span>else</span></span> <span>{
    </span><span><span>echo</span></span><span> </span><span><span>"沒有匹配結果。"</span></span> <span>;
}
</span><p>輸出示例：</p><pre>
匹配成功：
<span><span class="function_ invoke__">Array</span></span><span>
(
    [</span> <span><span>0</span></span> <span>] => 多字節字符[</span> <span><span>1</span></span> <span>] => 字符)
</span><h3><span><span>4</span></span> <span>. 注意事項</span><ul><li>確保字符串和正則模式的編碼一致，否則可能匹配失敗。</li><li> <span class="fun"><a href="/zh-tw/php/mb_ereg.html" target="_blank">mb_ereg</a></span>系列函數效率比<span class="fun">preg_*</span>系列稍低，但在多字節環境下更安全可靠。</li><li>如果需要全局匹配多個結果，可使用<span class="fun"><a href="/zh-tw/php/mb_ereg_search_getregs.html" target="_blank">mb_ereg_search_getregs()</a></span>或循環<span class="fun"><a href="/zh-tw/php/mb_ereg_search.html" target="_blank">mb_ereg_search()</a></span> 。</li></ul><h3> <span><span>5</span></span> <span>. 總結</span><p>使用<span class="fun">mb_ereg_search_regs</span>可以輕鬆獲取多字節字符串中正則匹配的子表達式，適合處理中文、日文等多字節文本場景。在使用時，注意編碼設置和搜索初始化順序，即可安全高效地完成匹配操作。</p></div></div>

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