I am trying to understand how preg_match_all() works and when looking at the documentation on the php.net site, I see some examples but am baffled by the strings sent as the pattern parameter. Is there a really thorough, clear explanation out there? For example, I don't understand what the pattern in this example means:
阅读背景：
了解preg_match_all（）函数调用中的模式
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