R列出具有多个条件的文件 [英] R list files with multiple conditions

问题描述

我想列出目录中满足某些条件(日期和货币)的所有文件.因此，只有一种情况，list.files中的参数pattern可以很好地工作:

I want to list all files in a directory that met certain conditions (date and currency). So with only one condition the argument pattern in list.files works well:

    file.ls <- list.files(path='~/DATA/PiP/Curvas/',pattern='20130801')

对于多种情况，我都尝试过:

For multiple conditions I've tried:

    file.ls <- list.files(path='~/DATA/PiP/Curvas/',pattern=c('20130801','USD'))

但结果与第一个相同.在list.files的pattern自变量中是否有多个条件?

But had the same result as the first one. Is there a way to have multiple criteria in pattern argument of list.files?

推荐答案

 Filter(function(x) grepl("USD", x), file.ls)

或者，您可以为pattern构造一个正则表达式，使其仅匹配包含两个字符串的文件名，但这是向导的游戏.

alternatively, you could construct a regular expression for pattern that only matches filenames containing both strings, but that's a wizard's game.

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