特定单词的php请求，但可以用空格分隔

Question

I have a question concerning regex, i.e. with the syntax that works with php. I know some basics about regex in php, so I know that I can match something with

preg_match("/[maxmustermann ]/u", $input_line, $output_array);

Now I want to match all text which contains optional several words which by could be seperated by an space.

Sorry I just dont know how to ask. I try to make an example. I have this text and want to match all the bold ones.

orem ipsum dolor sit amet, consectetur max adipiscing elit. Proin maxm pellentesque dui maxmustermann eu erat mustermann rhoncus tempor sit amet quis odio. Max Mustermann habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Max Muster Mann et malesuada fames ac ante ipsum primis in faucibus. Nam vitae nisl dui.

That means I have this two words: max and mustermann and I want to match words (one ore more) which containing the letters of max and/or mustermann in the order how they are but also random placed space.

Thank you

Answer 1

You can't do that with regex only. You need first to extract all words composed with your selected letters, and in a second time you have to filter these words. Something like this:

$word = 'maxmustermann';
preg_match_all('~\b[aemnrstux]+\b~ui', $txt, $matches);

$result = array_filter($matches[0], function ($i) use ($word) {
    return stripos($word, $i) !== false;
});

demo

You can proceed a similar way if you want to perform a replacement:

$word = 'maxmustermann';
$result = preg_replace_callback('~\b[aemnrstux]+\b~ui', function ($m) use ($word) {
    return stripos($word, $m[0]) !== false ? "#{$m[0]}#" : $m[0];
}, $txt);

demo