PHP正则表达式匹配字符串的单词列表

Question

我有一个数组中的单词列表。我需要在字符串中查找任何这些单词的匹配项。

单词列表示例

company
executive
files
resource

示例字符串

Executives are running the company

这是我写的功能，但它不起作用

$matches = array();
$pattern = "/^(";
foreach( $word_list as $word )
{
    $pattern .= preg_quote( $word ) . '|';
}

$pattern = substr( $pattern, 0, -1 ); // removes last |
$pattern .= ")/";

$num_found = preg_match_all( $pattern, $string, $matches );

echo $num_found;

输出

0

Answer 1

$regex = '(' . implode('|', $words) . ')';

Answer 2

<?php

$words_list = array('company', 'executive', 'files', 'resource');
$string = 'Executives are running the company';

foreach ($words_list as &$word) $word = preg_quote($word, '/');

$num_found = preg_match_all('/('.join('|', $words_list).')/i', $string, $matches);
echo $num_found; // 2

Answer 3

请务必添加“m”标记，以使^匹配一行的开头：

$expression = '/foo/m';

如果您不想匹配行的开头，请删除^