回用正则表达式匹配

Question

组

我想匹配：之间 一切 “{{环（东西）}}” 和第{{/环路（的东西）}}

文本例如：

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

这里是行不通的正则表达式：

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

正如你可以看到我想要重新使用“$ 1”的第一个匹配的组：我在想什么？

下面的PHP代码：

$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\1，不$1。

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