PHP preg_match函数变量提取

Question

假设我有一个像这样的字符串：

[$IMAGE[file_name|width|height]]

How can I match and getting 2 variables

$tag = "IMAGE"
$param = "file_name|width|height"

using a php preg_match function?

Answer 1

$string = '[$IMAGE[file_name|width|height]]';
// Matches only uppercase & underscore in the first component
// Matches lowercase, underscore, pipe in second component
$pattern = '/\[\$([A-Z_]+)\[([a-z_|]+)\]\]/';
preg_match($pattern, $string, $matches);

var_dump($matches);
array(3) {
  [0]=>
  string(32) "[$IMAGE[file_name|width|height]]"
  [1]=>
  string(5) "IMAGE"
  [2]=>
  string(22) "file_name|width|height"
}

Answer 2

不使用 preg_match，但效果也一样。

$var = '[$IMAGE[file_name|width|height]]';
$p1 = explode('[',$var);
$tag = str_replace('
,'',$p1[1]);
$param = str_replace(']','',$p1[2]);

echo $tag.'<br />';
echo $param;

Answer 3

<?php
$string = '[$IMAGE[file_name|width|height]]';
preg_match("/\[\\$(.*)\[(.*)\]\]/",$string,$matches);

$tag = $matches[1];  
$param = $matches[2];

echo "TAG: " . $tag;
echo "<br />";
echo "PARAM: " . $param;
?>