<code> preg_match("/(?).*?(?=)/", $html, $result);</code>报错
preg_match(): Compilation failed: lookbehind assertion is not fixed length at offset 24
是为啥呢？
就是\s*那里，php的正则不是这样写嘛？
<code> preg_match("/(?).*?(?=)/", $html, $result);</code>报错
preg_match(): Compilation failed: lookbehind assertion is not fixed length at offset 24
是为啥呢？
就是\s*那里，php的正则不是这样写嘛？
后瞻断言的内容被严格限制为只能用于匹配定长字符串。
http://php.net/manual/zh/regexp.reference.assertions.php
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