在两个分隔符之间提取字符串的最可靠方法

问题描述：

I've tried multiple functions to extract whatever between two strings, The delimiters might contain special characters, I guess that's why none worked for me.

My current function:

function between($str, $startTag, $endTag){
    $delimiter = '#';
    $regex = $delimiter . preg_quote($startTag, $delimiter) 
                        . '(.*?)' 
                        . preg_quote($endTag, $delimiter) 
                        . $delimiter 
                        . 's';
    preg_match($regex, $str, $matches);
    return $matches;
}

Example of string:

#{ST@RT}#
Text i want
#{END}#

#{ST@RT}#
Second text i want
#{END}#

How to improve that or suggest another solution to:

Support any kind of character or new lines
Extract multiple strings if found

Current Behavior: Only returns the first match, And also returns the match plus the surrounding tags which is unwanted

我尝试过多个函数来提取两个字符串之间的任何内容，分隔符可能包含特殊字符，我猜这就是为什么没有人对我有用。 p>

我当前的功能： p>

 函数（$ str，$ startTag，$ endTag）{
 $  delimiter ='＃'; 
 $ regex = $ delimiter。  preg_quote（$ startTag，$ delimiter）
。  '（。*？）'
。  preg_quote（$ endTag，$ delimiter）
。  $ delimiter 
。  's'; 
 preg_match（$ regex，$ str，$ matches）; 
返回$ matches; 
} 
  code>  pre> 
 
 字符串示例：  p> 
 
 
 ＃{ST @ RT}＃
Text我想要
＃{END}＃
 
＃{ST @ RT}＃
我想要的第二个文字
＃{  END}＃
  code>  pre> 
 
 如何改进或建议另一种解决方案： p> 
 
 

支持任何类型的 字符或新行 li> 
 
如果找到则提取多个字符串 li> 
  ul> 
 
 
  当前行为 ： strong>仅返回第一个匹配项，并返回匹配项以及不需要的周围标记 em>  p> 
  div>

答

Use the m option for multi-line regular expressions (it allows the . character to match newlines):

preg_match('/foo.+bar/m', $str);
//                    ^--- this

Use preg_match_all() to get your multiple strings:

preg_match_all($regex, $str, $matches);
return $matches[1]; // an array of the strings

Edit:

The reason your current code returns the match plus the surrounding tags is because you're using return $matches. The $matches array has several elements in it. Index 0 is always the entire string that matched the expression. Indexes 1 and higher are your capture groups. In your expression, you had only one capture group (the "string"), so you would have wanted to only do return $matches[1] instead of return $matches.

答

You can use preg_match_all to extract multiple strings, besides that your code seems simple enough, normally simpler is faster.

在两个分隔符之间提取字符串的最可靠方法

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