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preg_match的isU代表什么意义，preg_matchisu代表

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Release： 2016-06-13 08:53:27
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preg_match的isU代表什么意义，preg_matchisu代表

正则后面的/(.*)/isU  ，“isU”参数代表什么意思？
这是正则中的修正符.
i是同时查找大小写字母,
s是圆点(.)匹配所有字符,包括换行符.如果没有设定s,则不包括换行符.
U是反转了匹配数量的值使其不是默认的重复，而变成在后面跟上“?”才变得重复

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regular expression
source：php.cn
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