目录区别用法malloc用法calloc用法区别 开门见山，malloc与calloc在内存分配时，前者分配一整块，后者分配n块，并且后者在分配时会将内存置为0，前者不会内存里是垃圾数据。
This question already has answers here: Closed 12 years ago. Possible Duplicate: The Hostname Regex I\'m trying开发者_StackOverflow to use pcrepp (PCRE) to extract hostname from url.
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