We can use another form of variable expansion to select a specific substring, based on a specific character offset and length. Try typing in the following lines under bash.
可以根据特定字符偏移和长度，使用另一种形式的变量扩展，来选择特定子字符串。
In respect to the limitation of document similarity measuring based on VSM, this paper put forward an algorithm based on public substring of strings.
针对向量空间模型在文档相似度量方面的局限，提出了基于计算公共子串的文档相似度量算法。
Searches for the specified substring and returns the zero-based index of the last occurrence within the entire source string.
搜索指定的字符，并返回整个源字符串内最后一个匹配项的从零开始的索引。
Searches for the specified substring and returns the zero-based index of the first occurrence within the entire source string.
搜索指定的字符并返回整个源字符串内第一个匹配项的从零开始的索引。
Searches for the specified substring and returns the zero-based index of the first occurrence within the entire source string.
搜索指定的字符并返回整个源字符串内第一个匹配项的从零开始的索引。
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