R:如何选择目录中同时满足名称开头和结尾条件的文件? [英] R: How to select files in directory which satisfy conditions both on the beginning and end of name?

问题描述

我需要选择以"M"开头并以" .csv"结尾的文件.我可以轻松选择以"M"开头的文件:list.files(pattern ="^ M")，或以"csv"结尾的文件:list.files(pattern =" .csv").但是，如何同时选择同时满足这两个条件的文件?

I need to select files which start with "M" and end with ".csv". I can easily select files which start with "M" : list.files(pattern="^M"), or files which end with "csv": list.files(pattern = ".csv"). But how to select files which satisfy both conditions at the same time?

推荐答案

您可以尝试 glob2rx

lf <- list.files("path_to_directory/", pattern=glob2rx("M*.csv"))

其翻译为:

glob2rx("M*.csv")
[1] "^M.*\\.csv$"

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