正则表达式匹配PHP注释 [英] Regex Match PHP Comment

问题描述

我一直在尝试使用regex来匹配PHP评论。

  //（[^<] +）\r \\\
 
  

这是什么东西，但它不工作。

Ive也尝试过

  //（[^<] +）\r 
 //（[^<] +）\\\
 
 //（[^<] +）
  

...无效

解决方案

要匹配评论， PHP 5中的两种类型的注释： // 和

• 转到 / * 开头的行末


• 并转到 * /

考虑您先有这两行：

  $ filePath ='/home/squale/developpement/astralblog/website/library/HTMLPurifier.php'; 
 $ str = file_get_contents（$ filePath）; 
  

您可以匹配第一个：

  $ matches_slashslash = array（）; 
 if（preg_match_all（'＃//（。*）$＃m'，$ str，$ matches_slashslash））{
 var_dump（$ matches_slashslash [1]）; 
} 
  

第二个与：

  $ matches_slashstar = array（）; 
 if（preg_match_all（'＃/ \ *（。*？）\ * /＃sm'，$ str，$ matches_slashstar））{
 var_dump（$ matches_slashstar [1]）; 
} 
  

但你可能会遇到麻烦的' / ，或者切换注释，例如：这：

  / * 
 echo'a'; 
 / * / 
 echo'b'; 
 // * / 
  

（只需在开头添加一个斜杠切换两个块，如果你不知道这个技巧）

所以...很难检测评论只有regex ...

---

另一种方法是使用 PHP Tokenizer ，这显然知道如何解析

• token_get_all


• 解析器令牌列表



这样，您必须在PHP代码字符串上使用tokenizer

这样可能会：

  $ tokens = token_get_all（$ str）; 
 
 foreach（$ tokens as $ token）{
 if（$ token [0] == T_COMMENT 
 || $ token [0] == T_DOC_COMMENT）{
 //这是一个注释;-) 
 var_dump（$ token）; 
} 
} 
  

这样的东西：

 数组
 0 => int 366 
 1 => string'/ ** HTML Purifier * /'版本（长度= 31）
 2 => int 57 
  

或：

  array 
 0 => int 365 
 1 => string'//：TODO：make the config merge in，instead of replace 
'（length = 55）
 2 => int 117 
  

（just可能会删除 / 和 / * * / ，但这取决于你;至少，你已经提取了注释^^） p>

如果你真的想要检测注释没有任何奇怪的错误，由于奇怪的语法，我想这将是一种方式; - ）

Ive been trying to match PHP comments using regex.

//([^<]+)\r\n

Thats what ive got but it doesn't really work.

Ive also tried

//([^<]+)\r
//([^<]+)\n
//([^<]+)

...to no avail

解决方案

To match comments, you have to think there are two types of comments in PHP 5 :

• comments which start by // and go to the end of the line
• comments that start by /* and go to */

Considering you have these two lines first :

$filePath = '/home/squale/developpement/astralblog/website/library/HTMLPurifier.php';
$str = file_get_contents($filePath);

You could match the first ones with :

$matches_slashslash = array();
if (preg_match_all('#//(.*)$#m', $str, $matches_slashslash)) {
    var_dump($matches_slashslash[1]);
}

And the second ones with :

$matches_slashstar = array();
if (preg_match_all('#/\*(.*?)\*/#sm', $str, $matches_slashstar)) {
    var_dump($matches_slashstar[1]);
}

But you will probably get into troubles with '//' in the middle of string (what about heredoc syntax, btw, did you think about that one ? ), or "toggle comments" like this :

/*
echo 'a';
/*/
echo 'b';
//*/

(Just add a slash at the begining to "toggle" the two blocks, if you don't know the trick)

So... Quite hard to detect comments with only regex...

---

Another way would be to use the PHP Tokenizer, which, obviously, knows how to parse PHP code and comments.

For references, see :

• token_get_all
• List of Parser Tokens

With that, you would have to use the tokenizer on your string of PHP code, iterate on all the tokens you get as a result, and detect which ones are comments.

Something like this would probably do :

$tokens = token_get_all($str);

foreach ($tokens as $token) {
    if ($token[0] == T_COMMENT
        || $token[0] == T_DOC_COMMENT) {
        // This is a comment ;-)
        var_dump($token);
    }
}

And, as output, you'll get a list of stuff like this :

array
  0 => int 366
  1 => string '/** Version of HTML Purifier */' (length=31)
  2 => int 57

or this :

array
  0 => int 365
  1 => string '// :TODO: make the config merge in, instead of replace
' (length=55)
  2 => int 117

(You "just" might to strip the // and /* */, but that's up to you ; at least, you have extracted the comments ^^ )

If you really want to detect comments without any kind of strange error due to "strange" syntax, I suppose this would be the way to go ;-)

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