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？
Match a backspace if in character matching mode.
比赛一退格如果在字符匹配模式。
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。
After receiving the information, USES end character to detect mode end receive information.
信息接收完成时，采用结束字符检测方式结束接收信息。
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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