It became curious, how does laravel parse routes and understand which route to match with the correct url? For example url be processed by the appropriate route?

www.ru/post/100/comments/500

Route::get('/posts/{post}/comments/{comment}', [NameConroller::class, 'show']);

At first glance,

1. it seems that we should split the incoming route (for example explode()) by /.
2. Then find all routes where the first part starts with /post
3. From the routes found in the previous paragraph, we should understand (how?) that /{post} matches any number. Etc.

Perhaps someone dug into the source code or just knows how it works? It would be interesting to know)

CodePudding user response：

It all happens here https://github.com/laravel/framework/blob/9.x/src/Illuminate/Routing/RouteCollection.php#L153

Laravel loops through all your routes until it find a match which is checked here https://github.com/laravel/framework/blob/9.x/src/Illuminate/Routing/Route.php#L328

If you look at https://github.com/laravel/framework/blob/9.x/src/Illuminate/Routing/Matching/UriValidator.php you would see that /posts/{post}/comments/{comment} gets compiled to {^/posts/(?P<post>[^/] )/comments/(?P<comment>[^/] )$}sDu and it checked with regex

For an explanation on the regex look here https://regex101.com/r/VgsiHI/1

The first url to match is the route that gets the request