单词是由空格和非数字字符作为分隔的。
Words are delimited by white space or characters that are not alphanumeric.
前跟转义字符用于表示任意非数字字符的字符。
The character which when preceded by an escape character represents any non-digit character.
最大文件尺寸域包含非数字字符。只能指定数字字符。
The 'From' field contains non-numeric characters or a number greater than 65535.
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