Replace multiple whitespace characters with single whitespace characters.

用单个空格字符替换多个空格字符。

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You've seen metacharacters, such as \s, that match any whitespace characters.

您已经看到过匹配所有空格字符的元字符，例如 \s。

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To specify how whitespace characters should be handled, we would use the whitespace constraint.

为了指定空白符的处理方式，我们可以使用空白符约束。

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