假定页由换页符定界。
匹配任何空白字元，包括空格、制表符、换页符等。
Matches any white space character including space, tab, form - feed, and so on.
检查每个读取的字符是否为换页符；若是，则增加页计数器。
Check each char read to see whether it is a form feed; if so, increment the page counter.
该命令告诉selpg在输入中寻找换页符，并将其作为页定界符处理。
This tells selpg to look for form feed characters in the input and treat them as the page delimiters.
打印机会识别换页符并自动根据在新的页开始新行所需的行数移动打印头。
Printers recognize the form-feed character and automatically advance the print head by the required number of lines necessary to begin the next line of data on a new page.
不一定指那些在屏幕上可见的文本，还包括如换页换行符、段分隔符和图形字符等等。
Not always visible as text on the screen. For instance, includes page and line breaks, paragraph delimiters and picture characters.
不一定指那些在屏幕上可见的文本，还包括如换页换行符、段分隔符和图形字符等等。
Not always visible as text on the screen. For instance, includes page and line breaks, paragraph delimiters and picture characters.
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