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php正则表达式中的非贪婪模式匹配的使用

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Release： 2016-06-23 13:29:48
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php正则表达式中的非贪婪模式匹配的使用

通常我们会这么写： 

$str = "http://www.baidu/.com?url=www.sina.com/";preg_match("/http:(.*)com/", $str, $matches);print_r($matches);
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结果： 

Array ( [0] => http://www.baidu/.com?url=www.sina.com [1] => //www.baidu/.com?url=www.sina. )
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非贪婪模式匹配： 

$str = "<a http://www.baidu/.com?url=www.sina.com/";preg_match("/http:(.*?)com/", $str, $matches);print_r($matches);
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结果： 

Array ( [0] => http://www.baidu/.com [1] => //www.baidu/. )
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简单的说只要在一个字符后面跟上限定个数的特殊字符，匹配就是非贪婪模式了。小伙伴们是否理解了呢？ 

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php正则表达式中的非贪婪模式匹配的使用
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