如何在app.yaml中使用正则表达式处理虚拟子目录？

Question

I'd like to point all of my visitors to "single subdirectories" to one page, and all visitors to "double subdirectories" to another. Eg:

/foo/
/new/
/north/
/1-j4/

Would all point to 1.app, whereas

/foo/bar/
/new/york/
/north/west/
/1-j4/a_990/

Would all point to 2.app.

I figured I could do this with non-greedy regex matching, like so:

- url: /(.*?)/$
  script: 1.app

- url: /(.*?)/(.*?)/$
  script: 2.app

To my confusion, both /foo/ and /foo/bar/ resolve to script 1.app. Does the "lazy" regex force itself up to include the middle /, since that's the only way to get a match? How else can I do this? I have tried using (\\w*?) but get the same result.

Answer 1

The .*? will still match through any amount of / because . matches any character but a line break char (by default). You need to base your regexps on a negated character class, [^/]* , that matches 0 or more chars other than / .

To match directories with one part, use ^([^/]*)/?$ and to match those with 2, use ^([^/]*)/([^/]*)/?$ .

Note that if you plan to use the patterns in online Web testers, you will have to escape / in most of them as by default they use / symbol as a regex delimiter.

Answer 2

Yes, the (.*?) includes slashes, so will resolve to 1.app . If you put the 2.app handler first, it should do what you want:

- url: /(.*?)/(.*?)/$
  script: 2.app

- url: /(.*?)/$
  script: 1.app