PHP正则表达式 - 如何提取所有出现的模式

Question

I have a string that contains multiple WIKI-type tags. e.g. [[TAG:4567]]. I need to identify/extract all tags from the string so I can perform substitution later.

For example, for this string:

this is a test [[TITLE]] of more test [[LINK:27654]]

I want an array of:

0: [[TITLE]]
1: [[LINK:27654]]

I thought that PHP preg_match might work, but it returns a whole bunch of extra character between the regexp matches. But I think it only works with one match in the subject string. This is what I tried:

$subject = "this is a test [[TITLE]] of more test [[LINK:27654]]";
preg_match( '/(?<=\[\[)(.*)(?=\]\])/', $subject, $matches );
print_r($matches);

But it gives me:

Array ( 
    [0] => TITLE]] of more test [[LINK:27654 
    [1] => TITLE]] of more test [[LINK:27654 
) 

Which isn't what I need. Is there a simple way to extract the tags? I'd really like to avoid iterating through the string and extracting manually.

Answer 1

Try this code snippet here

<?php

ini_set('display_errors', 1);
$subject = "this is a test [[TITLE]] of more test [[LINK:27654]]";
preg_match_all('/\[\[.*?\]\]/', $subject, $matches );
print_r($matches);