php - 正则表达式查找后面没有字母的单词

Question

我正在遍历文本字符串(在 php 中)以将数据库中的某些关键字更改为链接。问题是当数据库中的单词彼此存在时，例如:

开发，开发，开发...

我最终得到:

"Random string with the word <a href="developer"><a href="develop">develop</a>er</a> in it"

我只需要在 developer 周围包装一个标签，而不是其中的 develop ...

这是我当前的功能:

function hyper($haystack){ 
    $query = "SELECT * FROM `hyperwords` ";  
    $query .= "WHERE `active` = '1' ";
    $query .= "ORDER BY LENGTH(hyperword) DESC ";  
    $result = mysql_query($query);
    while($row = mysql_fetch_array($result)){
        $needle = $row['hyperword'];
        $link = $row['link'];
        $haystack = preg_replace("/($needle)/iu", "<a class='meta' href='$link'>$1</a>", $haystack);
    }
    return $haystack;
}

提前致谢!!!

Answer 1

$altered = preg_replace("/\b($needle)\b/iu", "<a class='meta' href='$link'>$1</a>", $altered);

是你需要的:)

The metacharacter \b is an anchor like the caret and the dollar sign. It matches at a position that is called a "word boundary". This match is zero-length.

参见 here获取更多信息:)