php - 在正则表达式中重用匹配组

Question

我正在尝试匹配:“{{ loop (something) }}”和第一个 {{/loop (that something) }}

之间的所有内容

文本示例:

{{ LOOP data }}
  <span> Member key       =  {{.key}}  </span>
  <span> Member value     =  {{.}}     </span>
  <span> Member member    =  {{name}}  </span>
  <span> Iteration number = {{.counter}} </span>
{{ /LOOP data }} 

这是正则表达式不起作用:

/\{\{\s+loop\s+(.+?)\s+\}\}([\w\W]+?)\{\{\s+\/loop\s$1\s+\}\}/i

如您所见，我正在尝试重用第一个匹配组和“$1”:我错过了什么？

PHP代码如下:

$text = '
{{ LOOP data }}
  <span> Member key       =  {{.key}}  </span>
  <span> Member value     =  {{.}}     </span>
  <span> Member member    =  {{name}}  </span>
  <span> Iteration number = {{.counter}} </span>
{{ /LOOP data }}   
';

preg_match('/\{\{\s+loop\s+(.+?)\s+\}\}([\w\W]+?)\{\{\s+\/loop\s\1\s+\}\}/i', $text, $match);
print_r($match);
die;

Answer 1

我相信你想要 \1，而不是 $1。

更多信息:http://www.regular-expressions.info/brackets.html#usebackrefinregex