英语语法分析

substring-before()? disable-output-escaping?

还是 substring-before() 呢？ 或是 disable-output-escaping 呢？

To mark a matched substring for future reference.

记录一个已匹配的子串用作后面的参考引用。

The length argu we are pirates, these data are stolen from youdao specifies the length of the desired substring.

长度参数指定了所需子字符串的长度。