PHP：未定義抵消：3 - preg_match_all

Question

我有URL結構從例如：

http://www.example.com/directory/some-text-a1-vs-sec-text-b2-vs-third-text-vs-last-text-c1/

我正則表達式是：

preg_match_all("/([^\/.]+?)(?:-vs-|\.\w+$)/", $html, $matches); 

預期結果：

some-text-a1 
sec-text-b2 
third-text 
last-text-c1 

結果我得到：

some-text-a1 
sec-text-b2 
third-text 
Notice: Undefined offset: 3 in F:\xampp\htdocs\url.php on line 41 

全碼：

$html = "http://www.example.com/directory/some-text-a1-vs-sec-text-b2-vs-third-text-vs-last-text-c1/"; 
preg_match_all("/([^\/.]+?)(?:-vs-|\.\w+$)/", $html, $matches); 

$prvi = "some-text-a1"; 
$drugi = "sec-text-b2"; 
$treci = "third-text"; 
$cetvrti = "last-text-c1"; 

echo "URL: ".$html."<br>"; 

if($prvi == $matches[1][0]){echo "1st O.K. - ".$prvi." = ".$matches[1][0]."<br>";} 
if($drugi == $matches[1][1]){echo "2nd O.K. - ".$drugi." = ".$matches[1][1]."<br>";} 
if($treci == $matches[1][2]){echo "3rd O.K. - ".$treci." = ".$matches[1][2]."<br>";} 
if($cetvrti == $matches[1][3]){echo "4th O.K. - ".$cetvrti." = ".$matches[1][3]."<br>";} 

想法我缺少什麼？我想結束斜槓/是我的正則表達式中的問題。

任何想法？謝謝！

Answer 1

試試這個

(?<=vs-)(.*?)(?=-vs)|(?<=\/)([^\/]*?)(?=-vs)|(?<=vs-)(.*?)(?=\/|$) 

Regex demo

說明：
(?<=…)：正回顧後sample
(…)：捕獲組sample
.：除了行中的任何字符打破sample
*：零次或多次sample
?：一旦或無sample
(?=…)：正向前查找sample
|：輪換/ OR操作數sample
\：轉義特殊字符sample
[^x]：一個字符不是x sample
$：字符串或行結束的結束取決於多模式sample

PHP：

<?php 
$re = "/(?<=vs-)(.*?)(?=-vs)|(?<=\\/)([^\\/]*?)(?=-vs)|(?<=vs-)(.*?)(?=\\/|$)/"$ 
$str = "http://www.example.com/directory/some-text-a1-vs-sec-text-b2-vs-third-t$ 

preg_match_all($re, $str, $matches); 
print_r($matches[0]); 

輸出：

Array 
(
    [0] => some-text-a1 
    [1] => sec-text-b2 
    [2] => third-text 
    [3] => last-text-c1 
) 

Answer 2

這是一種不同的方法 - 使用parse_url和爆炸功能。

<?php 
$url = 'http://www.example.com/directory/some-text-a1-vs-sec-text-b2-vs-third-text-vs-last-text-c1/'; 

$parsedUrl = parse_url($url); 

var_dump($parsedUrl); 

$path = explode('/',trim($parsedUrl['path'],'/')); 

var_dump($path); 

if (is_array($path) && $path[0] === 'directory') { 
     if (isset($path[1])) { 
       $vs = explode('-vs-',$path[1]); 
       var_dump($vs); 
     } 
}