在设定位置提取字符 [英] Extract characters at a set position

问题描述

我试图找到一个函数来提取字符串中特定位置的字符.例如，我有一个带有日期的长文件名，而我只想以日期结尾:

I am trying to find a function that will extract characters at a certain position within a string. For example, I have a long file name with a date in it, and I want to end up with only the date:

'LT50420331984221PAC00_B7.tif'

我只想要1984221"部分.我想出了一个复杂的函数，但想知道是否有更优雅的解决方案.

and I want only the '1984221' portion. I've come up with a complicated function, but was wondering if there is a more elegant solution.

推荐答案

如果您知道日期在字符串中的确切位置，您可以使用

If you know the exact position of the date in your string you can use

substr('LT50420331984221PAC00_B7.tif', 10, 16)

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