php - 如何仅在字符串中查找完整的单词

Question

如何只在字符串中查找完整的单词

<?php
$str ="By ILI LIKUALAYANA MOKHTAKUALAR AND G. SURACH Datuk Dr Hasan Ali says he has no intention of joining Umno. Pic by Afendi Mohamed KUALA LUMPUR: FORMER Selangor Pas commissioner Datuk Dr Hasan Ali has not ruled out the possibility of returning to Pas' fold";
$search ="KUALA";
?>

Answer 1

要查看特定单词是否在字符串中，您可以使用带单词边界的正则表达式，如下所示:

$str = "By ILI LIKUALAYANA MOKHTAKUALAR AND G. SURACH Datuk Dr Hasan Ali says he has no intention of joining Umno. Pic by Afendi Mohamed KUALA LUMPUR: FORMER Selangor Pas commissioner Datuk Dr Hasan Ali has not ruled out the possibility of returning to Pas' fold";
$search = "KUALA";

if (preg_match("/\b$search\b/", $str)) {
    // word found
}

这里的\b表示“一个词的边界”。它实际上不匹配任何字符，只匹配边界，因此它匹配单词和空格之间的边缘，也匹配字符串末端的边缘。

如果需要使其不区分大小写，可以将 i 添加到匹配字符串的末尾，如下所示:"/\b$search\b/i".

如果您需要知道结果在字符串中的什么位置，您可以添加第三个 $matches 参数来提供有关匹配的详细信息，如下所示:

if (preg_match("/\b$search\b/", $str, $matches)) {
    // word found
    $position = $matches[1];
}