| 1. | Finds target in string ; 0 if not found
在字符串中查找指定子串，如果没有找到则返回0 |
| 2. | Inserts or overlays new into string at position n
在字符串中位置n处插入或覆盖新的子串 |
| 3. | Replaces old with new in string
在字符串中用新的子串替换旧的子串 |
| 4. | Returns the index of the first character of a specified substring in a string
返回指定子串首字符在串中的索引。 |
| 5. | That share some substring
共享某些子串： |
| 6. | Substr won t modify the original string , but returns the substring instead
Substr ( )不会修改原始字符串，而是返回子串。 |
| 7. | Longest common substring
最长公共子串 |
| 8. | You can use this function to compare two strings or substrings of two strings
可以使用此函数来比较两个字符串或两个字符串的子串。 |
| 9. | There is one value for each clause and a final value that specifies the length of the full string
每个子串对应一个值，最后一个值确定整个字母组合字符串的长度。 |
| 10. | Mystring should be either a string variable or a literal string from which you d like to extract a substring
Mystring应该是要从中抽取子串的字符串变量或文字字符串。 |
