Question

In PHP I’m receiving a string from the user for a local file directory $path

I want to know if they’ve included the trailing slash (/) or not. I would like this to be cross platform so I’d like to use the PHP constant DIRECTORY_SEPARATOR

My failed attempts include trying to do a preg_match like

preg_match("/" . DIRECTORY_SEPARATOR . "$/", $path);

I basically just want an elegant way to test if the string ends with the DIRECTORY_SEPARATOR.

Answer 1

To fix your regexp:

preg_match("/" . preg_quote(DIRECTORY_SEPARATOR) . "$/", $path);

But there may be simpler ways to achieve your goal:

rtrim($path,DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;