正则表达式:匹配的打开/关闭标签接受另一个同名的打开/关闭标签 [英] Regex: matching open/close tags which accepts another open/close tag with same name

问题描述

正则表达式的粉丝们，嗨.在下面的代码中，有两个父标签(T1-4 和 T5-6)和一个子标签(T2-3).

Regex fans, hi. In the code below, there are two parent tags (T1-4 and T5-6), and one child tag (T2-3).

你怎么搭配T1-4?或者一般来说，你如何匹配父标签?

How do you match T1-4 ? or in general, how do you match the parent tags ?

<?php
$subject = '

{{poo}}             # T1
    Hello

    {{poo}}         # T2
        Nested 1
    {{/poo}}        # T3

{{/poo}}            # T4


{{poo}}             # T5
    Bye
{{/poo}}            # T6



';

$p = '!{{(\w+)}}(.*){{/\1}}!s';     // matches T1-6, too greedy
$p = '!{{(\w+)}}(.*?){{/\1}}!s';    // matches T1-3, not what I want

$p = '`(?xs) # xtended

{{(\w+)}}

.*?
(?R)?       # currently working on this one...

{{/\1}}


`';



preg_replace_callback($p, function($match){
    var_dump($match);
}, $subject);

推荐答案

这可能是您要找的:

$p = '`(?x)
{{(\w+)}}
# ( # you need probably this capture group later
(?>
    [^{]++
  |
    { (?!{)
  |
    {{ (?! /? \1 \b) # if needed you can add }} in the lookahead
  |
    (?R)
)*
# )
{{/\1}}
`';

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