This way, you can modify the number or string literal in just one place (the value of the field), instead of doing a search and replace throughout your code.

这样，在一个位置(字段的值)就可以实现对所有数字或字符串文字的修改，再也无需在整篇代码中执行查询和替代了。

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It also demonstrates how to do search and replace and string splitting.

它还演示了如何进行搜索和替换以及字符串拆分。

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When you want to search and replace the contents of a string.

当你要搜索并替换字符串内容时。

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