快递路线中`/：foo *`和`/：foo（。*）`有什么区别？

Question

In express, we can define some endpoints with some paths:

app.get('/:foo*', function(req, res) { ... });

app.get('/:foo(.*)', function(req, res) { ... });

The two paths are quite similar, what's the difference between them?

Answer 1

* matches zero or more of the preceding tokens

Given the string /:foo/apple/banana/:foo/:1234

/:foo* matches: /:foo/apple/banana/:foo/:1234
                ^^^^^             ^^^^^

(.*) is a capturing group which will match all 0 or more of the preceding characters. The character in question is a wild card which means when we see /:foo we will continue to match until we reach the end of the string

Given the string /hello/world/:foo/bar?id=123

/:foo(.*) matches /hello/world/:foo/bar?id=123
                              ^^^^^^^^^^^^^^^^