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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When specified during a search and replace operation, then sections of the character container sequence being searched that do match the regular expression, are not copied to the output string.

指定进行搜索和替换的操作中，字符容器序列中不被匹配的部分，不拷贝到输出字符。

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You can use regular expressions to search for patterns in a string, replace text, and extract substrings.

您可以使用规则运算式来搜寻字串中的模式、取代文字，以及撷取子字串。

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You can use regular expressions to search for patterns in a string, replace text, and extract substrings.

您可以使用规则运算式来搜寻字串中的模式、取代文字，以及撷取子字串。

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