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.

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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.

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缺省分隔符为X'0 A '，此字符表示单个换行字符。

The default is X '0a' which represents a single line feed.

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s——空白字符，如制表符或换行符。

S — a white-space character, like TAB or new line.

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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.

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换行符算作一个字符。

New line characters count as one character.

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换行符算作一个字符。

New line characters count as one character.

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