Mode n: Make the dot match any character, including new lines.
模式n：使点匹配任何字符，包括新行。
S_ISCHR(mode) -- Is this a character special file?
S_ISCHR(mode)——是否为字符特殊文件？
The best mental mode is a kind of character with both male and female traits.
男女双性化性格是一种最佳的心理健康模式。
Q. Why don't character ranges work properly (POSIX mode only)?
为什么字符范围工作不正常（POSIX模式）？
Q. Why don't character ranges work properly (POSIX mode only)?
为什么字符范围工作不正常（POSIX模式）？
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