preg_match匹配可选字符串，但不匹配所有字符串

Question

以下面的正则表达式匹配为例。

preg_match('!^publisher/([A-Za-z0-9\-\_]+)/([0-9]+)/([0-9]{4})-(january|february|march|april|may|june|july|august|september|october|november|december):([0-9]{1,2})-([0-9]{1,2})/([A-Za-z0-9\-\_]+)/([0-9]+)(/page-[0-9]+)?$!', 'publisher/news/1/2010-march:03-23/test_title/1/page-1', $matches); 
print_r($matches); 

它产生以下：

Array 
(
    [0] => publisher/news/1/2010-march:03-23/test_title/1/page-1 
    [1] => news 
    [2] => 1 
    [3] => 2010 
    [4] => march 
    [5] => 03 
    [6] => 23 
    [7] => test_title 
    [8] => 1 
    [9] => /page-1 
) 

然而，由于最后一场比赛是可选的，也可以与符合以下“发行人/新闻/ 1/2010年三月工作：03-23/test_title/1" 。我的问题是，如果它存在，我希望能够匹配（/ page- [0-9] +），但只匹配页码，以便“publisher/news/1/2010-march：03-23/test_title/1 /页-1" 将匹配像这样：

Array 
(
    [0] => publisher/news/1/2010-march:03-23/test_title/1/page-1 
    [1] => news 
    [2] => 1 
    [3] => 2010 
    [4] => march 
    [5] => 03 
    [6] => 23 
    [7] => test_title 
    [8] => 1 
    [9] => 1 
) 

我试过以下的正则表达式

'!^publisher/([A-Za-z0-9\-\_]+)/([0-9]+)/([0-9]{4})-(january|february|march|april|may|june|july|august|september|october|november|december):([0-9]{1,2})-([0-9]{1,2})/([A-Za-z0-9\-\_]+)/([0-9]+)/?p?a?g?e?-?([0-9]+)?$!' 

这工作，但它也将匹配“发行人/新闻/ 1/2010年三月：03-23/test_title/1/1" 。我不知道要进行比赛但是没有回到比赛中？在一个正则表达式中可能吗？

Answer 1

绝对不匹配publisher/news/1/2010-march:03-23/test_title/1/whatever

!^publisher/([A-Za-z0-9\-\_]+)/([0-9]+)/([0-9]{4})-(january|february|march|april|may|june|july|august|september|october|november|december):([0-9]{1,2})-([0-9]{1,2})/([A-Za-z0-9\-\_]+)/([0-9]+)(?:/page-([0-9]+))?$! 

要仍然匹配publisher/news/1/2010-march:03-23/test_title/1/whatever却忽略了/whatever：

!^publisher/([A-Za-z0-9\-\_]+)/([0-9]+)/([0-9]{4})-(january|february|march|april|may|june|july|august|september|october|november|december):([0-9]{1,2})-([0-9]{1,2})/([A-Za-z0-9\-\_]+)/([0-9]+)(?:(?:/page-([0-9]+))|/.*)?$! 

Answer 2

也许这样的：

'!^publisher/([A-Za-z0-9\-\_]+)/([0-9]+)/([0-9]{4})-(january|february|march|april|may|june|july|august|september|october|november|december):([0-9]{1,2})-([0-9]{1,2})/([A-Za-z0-9\-\_]+)/([0-9]+)(/page-([0-9]+))?$!' 

Answer 3

这是正则表达式，你是什么寻找：

^publisher/([A-Za-z0-9\-\_]+)/([0-9]+)/([0-9]{4})-(january|february|march|april|may|june|july|august|september|october|november|december):([0-9]{1,2})-([0-9]{1,2})/([A-Za-z0-9\-\_]+)/([0-9]+)/(?:page-(\d+))? 

你可以在rexexbuddy中测试它。如果没有设置“page-1”，则会将var 9留空，否则将设置它。