Regex to match URL Path pattern-CodePudding

I have 2 URI Patterns with their regex:

1. "/api/orders/{id}/{version}"   ->      "^/api/orders/. /. $"
2. "/api/orders/{id}"             ->      "^/api/orders/. $"

But with the above regex, String /api/orders/123-blah$-789/v1 matches both the regex patterns 1 and 2.

What regex can I use so that the above string matches only pattern 1's regex and not 2?

(The path may or may not be URL Encoded)

CodePudding user response：

You could keep your first regex (^/api/orders/. /. $) and replace the second one with this:

^\/api\/orders\/[[\p{Alnum}\p{Punct}]&&[^\/]] $

Basically, you accept every symbol or alphanum character following orders/ unless there is a slash in there. Like so, you're guaranteed that orders/ will be followed only by a single subpath.

Here is a link to test the regex:

https://regex101.com/r/KMEeXX/2

CodePudding user response：

You can restrict both pattern by using a negated character class [^/] matching 1 characters excluding a forward slash.

For the first pattern you can use:

^/api/orders/[^/] /[^/] $

Regex demo

For the second pattern you can use

^/api/orders/[^/] $

Regex demo

CodePudding user response：

This might seem a little hardcoded but gets the job done.
And personally I prefer regex to be very specific.

    Pattern p = Pattern.compile("^/api/orders/. /. $");
    Pattern q = Pattern.compile("^/api/orders/[^/] $");
    
    System.out.println(p.matcher("/api/orders/123-456-789/v1").matches());
    System.out.println(q.matcher("/api/orders/123-456-789/v1").matches());

    System.out.println(p.matcher("/api/orders/123-456-789").matches());
    System.out.println(q.matcher("/api/orders/123-456-789").matches());