缺省分隔符为X'0 A ',此字符表示单个换行字符。
因为有这个限制,数据字符串必须不包含任何换行符。
Because of this restriction, the data string must not contain any line breaks.
标志是用来控制替换行为的单个字符。
The flags are single characters that control the substitution's behavior.
s——空白字符,如制表符或换行符。
前跟转义字符用于表示换行符的字符。
The character which when preceded by an escape character represents the newline character.
换行符算作一个字符。
换行符算作一个字符。
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