正则表达式:在两个定界符之间获取第n个字符 [英] Regex: Get nth character between two delimiters

问题描述

我有一个示例字符串

1836248_NNY_01.pdf

但也可以

18362481_YYN_102.pdf

我需要在两个下划线之间得到第n个字符.

到目前为止，我的正则表达式是\_(.*?)\_，以便在下划线之间得到字符.但是跟进之后，我不知道如何获得第二个N.

https://regex101.com/r/XUMKyf/1/

解决方案

您可以使用\_.{1}(.).*\_并将1替换为所需的任何内容.
因此，0将是第一个字符，1是第二个字符，依此类推.

示例: https://regex101.com/r/XUMKyf/3

I have an example string

1836248_NNY_01.pdf

but it can also be

18362481_YYN_102.pdf

And I need to get the nth character between the two underscores.

So far my regex is \_(.*?)\_ to get the characters between the underscores. But following up I can't figure out how to get the 2nd N for example.

https://regex101.com/r/XUMKyf/1/

解决方案

You could use \_.{1}(.).*\_ and replace the 1 with whatever you want.
So 0 would be the first char, 1 the second, and so on.

Example: https://regex101.com/r/XUMKyf/3

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