正则表达式基础：带星号的preg_match（）值

I have this regex:

preg_match("/(comment|vid|nice)/i", $id)

And I want vid part to match with video or ivideo.

What's the right way to add asterisks in vid so it matches with those terms?

Surely there are many options for this, but one that comes to mind is

preg_match("/(comment|[\w-]*vid[\w-]*|nice)/i", $id)

whereas

1. \w matches A-Z, a-z, 0-9 and _
2. - simply matches -
3. [...] is a character class, so it matches both 1. and 2.
4. * means matching 0 or more times

Btw you can fiddle with the matches by simply using an online tester like http://www.regextester.com.

You can use \p{L}* where \p{L} matches any lower- and uppercase letters and * is a quantifier matching zero or more occurrences:

(comment|\p{L}*vid\p{L}*|nice)

See the regex demo and PHP demo:

$re = '/(comment|\p{L}*vid\p{L}*|nice)/';
$s = "new ivideo";
if (preg_match($re, $s, $m)) {
    echo $m[0];
}

I would do

preg_match("/(comment|i?vid|nice)/i", $id)

The ? makes the preceding i optional.

Regex 101 demo: https://regex101.com/r/tK2iK2/1

PHP Demo: https://eval.in/494456

if(preg_match("/(comment|i?vid|nice)/i", 'video-player-5681ad0a08875')) {
     echo 'It is a match';
} else {
     echo  'It is not a match';
}