列出论述如何针对字符串使用搜索和替换功能的主题。
Lists topics that discuss how to use search and replace for strings.
功能代码：执行某一特别工作而不是产生字符的代码。
Function code: a code which performs a special task rather than produces the characters.
累加替换功能，能在替换中对替换字符串的前缀和后缀实现累加。
Cumulative replace function, can replace the replacement string for prefix and suffix to achieve cumulative.
写功能向第0行里面写入一个字符串。
Write writes a generated string into row 0 of the last created table.
功能实验：检查输入字符串是否有重复的字母。
Function test: Check whether the input string has duplicate letters.
功能实验：检查输入字符串是否有重复的字母。
Function test: Check whether the input string has duplicate letters.
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