使用preg_match查找括号之间的所有文本

Question

I am trying to search a document for tags, to later replace them.

I am using preg_match, but am having some difficulty.

preg_match('/\[.*\]/', $haystack, $matches);

Searching through the following text

[TODAY_DATE]

Re: Demand for Payment

[ADDRESS] [ADDRESS_LINE_2] ...etc

print_r($matches);

returns

Array ( [0] => [TODAY_DATE] )

How should I adjust my regex to return all matches?

Answer 1

Use preg_match_all . As the name suggests, it matches more than once.

preg_match_all('/\[.*?\]/', $haystack, $matches);
var_dump($matches);

Also use reluctant quantifier .*? instead of greedy one.