Perl的正則表達式的解釋

Question

我的正則表達式是這樣的：

s/<(?:[^>'"]|(['"]).?\1)*>//gs 

，我不知道究竟是什麼意思。

Answer 1

正則表達式旨在從輸入中刪除HTML標記。

它匹配以<開頭並以>結尾的文本，其中包含非> /非引號或引用字符串（可能包含>）。但它似乎有一個錯誤：

該.?說，報價可能包含0或1個字符;它可能打算是.*?（0個或更多字符）。並且爲了防止回溯在某些奇怪的情況下使.匹配報價，它需要將(?: ...)分組更改爲佔有（>而不是:）。

Answer 2

此工具可以解釋的細節：http://rick.measham.id.au/paste/explain.pl?regex=%3C%28%3F%3A[^%3E%27%22]|%28[%27%22]%29.%3F\1%29*%3E

NODE      EXPLANATION 
-------------------------------------------------------------------------------- 
    <      '<' 
-------------------------------------------------------------------------------- 
    (?:      group, but do not capture (0 or more times 
          (matching the most amount possible)): 
-------------------------------------------------------------------------------- 
    [^>'"]     any character except: '>', ''', '"' 
-------------------------------------------------------------------------------- 
    |      OR 
-------------------------------------------------------------------------------- 
    (      group and capture to \1: 
-------------------------------------------------------------------------------- 
     ['"]      any character of: ''', '"' 
-------------------------------------------------------------------------------- 
    )      end of \1 
-------------------------------------------------------------------------------- 
    .?      any character except \n (optional 
          (matching the most amount possible)) 
-------------------------------------------------------------------------------- 
    \1      what was matched by capture \1 
-------------------------------------------------------------------------------- 
)*      end of grouping 
-------------------------------------------------------------------------------- 
    >      '>' 

因此試圖刪除HTML標籤作爲YSTH也提到了。