通过正则表达式排序数组的更好方法？

I have this array:

我有这个数组:

arr = ["/Users/user/Documents/public/170/41/texts/10.txt",
        "/Users/user/Documents/public/170/41/texts/11.txt",
        "/Users/user/Documents/public/170/41/texts/12.txt",
        "/Users/user/Documents/public/170/41/texts/14.txt",
        "/Users/user/Documents/public/170/41/texts/15.txt",
        "/Users/user/Documents/public/170/41/texts/18.txt",
        "/Users/user/Documents/public/170/41/texts/6.txt",
        "/Users/user/Documents/public/170/41/texts/8.txt"]
arr = ["/Users/u