函数返回的字符串可能包含二进制字符，所以可能返回包含系统定界字符的密文，而这个定界字符之前是不存在的。
Function could potentially contain any binary character, it is possible to return a ciphertext containing a system delimiter where one did not previously exist.
因为IXF格式没有用定界符分隔列和行，所以数据中可以使用任何字符。
Since IXF format does not require delimiters to separate columns and rows, any characters can be used in data.
在您的程序中有特定含义的字符：例如，用于定界的字符。
Characters that have a special meaning in your program: For instance, characters used as delimiters.
对于 <c:forTokens> 而言，通过items属性指定要标记化的字符串，而通过delims 属性提供用于生成标记的一组定界符。
For <c:forTokens>, the string to be tokenized is specified through the items attribute, while the set of delimiters used to generate the tokens is provided through the delims attribute.
用于换页定界的页的逻辑大体上相同，只是稍稍简单一些，因为不需要行计数器：使用getc库函数逐个读取字符。
The logic used for form-feed-delimited pages is roughly the same, but slightly simpler, as there is no need for a line counter: Read char by char using the getc library function.
定界符：一个字符或者字符串，用来确定字符分割时候的分界。
A character or string used to indicate where a string should be split.
前向否定界定符。与肯定界定符相反；当所含表达式不能在字符串当前位置匹配时成功。
Negative lookahead assertion. This is the opposite of the positive assertion; it succeeds if the contained expression doesn't match at the current position in the string.
前向否定界定符。与肯定界定符相反；当所含表达式不能在字符串当前位置匹配时成功。
Negative lookahead assertion. This is the opposite of the positive assertion; it succeeds if the contained expression doesn't match at the current position in the string.
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