PHP中的正则表达式（模式）匹配MORE 8的格式[关闭]

Question

How to create regex (pattern) in PHP to match the exact format of this string:

MORE 8

Where 8 is an id.

As an example, I have the following code:

$id = 8;
$keyword = MORE;
$string = $keyword." ".$id;

Now, I need a regex pattern to match my $string variable.

$regex_pattern = "/MORE ([0-9]*)/";

Answer 1

If you want to retrieve the id (i.e. 8) from the string MORE 8, you can use the regexp /MORE ([0-9]*),/.

Example:

$string = "MORE 8,";
$regexp = "/MORE ([0-9]*),/";

$matches = [];
if(!preg_match($regexp, $string, $matches)) {
    die("Input string doesn't matches the regexp");
}

$id = $matches[0]; // $id = 8