php - Preg_replace ：“foo”、“bar”、“foo bar”和“bar foo”

Question

我使用正则表达式来查找一些单词，并对单词/字符串做一些事情。

我的例子：

我不想用我找到的所有单词设置<strong>标签：

$string = 'Hello, there is foo, after there is bar but now I need foo bar.'

$html = preg_replace('/(foo|bar)/', '<strong>$1</strong>', $string);

$html will be 'Hello, there is <strong>foo</strong>, after there is <strong>bar</strong> but now I need <strong>foo</strong> <strong>bar</strong>.'

而且我不想，如果他们是 1 个单词，然后是 1 个搜索的其他单词，那么结果：

'Hello, there is <strong>foo</strong>, after there is <strong>bar</strong> but now I need <strong>foo bar</strong>.'

如何修改我的正则表达式以获取我们之间的 2 个单词并在没有分隔标签的情况下对其进行处理？

谢谢

Answer 1

$search = 'foo bar blah';
$string = 'Hello, there is foo, after there is bar but now I need foo bar blah.';

$search = preg_quote($search);
$regex = $search . '|' . str_replace(' ', '|', $search);

$html = preg_replace('/\b(' . $regex . ')\b/', '<strong>$1</strong>', $string);

echo $html; // Outputs: Hello, there is <strong>foo</strong>, after there is <strong>bar</strong> but now I need <strong>foo bar blah</strong>.

Answer 2

Answer 3

$string = 'Hello, there is foo, after there is bar but now I need foo bar.';
$string.= ' Lets throw a bar foo in there as well!';

$html = preg_replace('/(bar foo|foo bar|foo|bar)/', '<strong>$1</strong>', $string);

echo $html;