PHP:这段正则是验证啥的,看不懂?该怎么处理

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Release: 2016-06-13 12:24:29
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PHP:这段正则是验证啥的,看不懂?
这段正则是验证啥的,看不懂?
/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/

求教!!!
------解决思路----------------------
验证是否为 utf-8 字符

其中
[\x01-\x7f] 单字节 utf-8
[\xc2-\xdf][\x80-\xbf] 2字节 utf-8
\xe0[\xa0-\xbf][\x80-\xbf] 3字节 utf-8
[\xe1-\xef][\x80-\xbf][\x80-\xbf] 3字节 utf-8
\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf] 4字节 utf-8
[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf] 5字节 utf-8

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