普通的前pression为不允许的父目录的文件路径 [英] Regular expression for file path which doesn't allow parent directories

问题描述

我在找编写必须与一些preFIX开始一个文件路径正则表达式。在这种情况下，它应该与'/罐/家居/'开始。我也想确保它不包含'/ .. - 没有跳起来的父目录

I'm looking to write a regex for a file path that must start with some prefix. In this case it should start with '/tank/home/'. I also want to make sure that it contains no '/..' -- no jumping up to parent directories.

我花了一段时间，也没说有什么发现完全正确摆弄周围。我定居在使用两个正则表达式，其必须匹配所述第一和第二，必须不匹配

I spent a while fiddling around without coming up with anything quite right. I settled on using two regexes, the first which must match and the second which must not match:

'^/tank/home/'

'/\.\.(/.*)?$'

这是不是做什么，我认为它呢？是否有更简单的方法？

Does this do what I think it does? Is there an easier way?

这是一个bash脚本，因为它的价值。

This is in a bash script, for what it's worth.

推荐答案

您可以扩大DAV的正则表达式包含一个额外的结尾斜杠：

You can expand Dav's regex to include an extra trailing slash:

^(?!.*/\.\./.*)/tank/home.*$

但是......一个更好的选择是，以确保道路的结果是什么，在/箱/家用启动：

But... a better option might be to make sure that the result of the path is something that starts under /tank/home:

FILEPATH=$(readlink -f $YOURFILE)
[[ $FILEPATH =~ ^/tank/home/ ]] && echo "starts with /tank/home/"

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