CODEWITHSUNDEEP
regex
roc
roc

Reputation: 11

Regex - Match URL Paths that contain a trailing /

I am trying to match on any incoming requests that don't have a trailing slash. I also want to capture the URL path, to use in a capture group. Here is what I've gotten so far.

Incoming URL: http://www.example.com/path/to/

Regex: http:\/\/www.example.com\/(.*)[.\/]

Here's a link to the regex tester results

This captures what I want, but it always matches on all URLs - not the URLs that don't contain a trailing slash.

The regex processor is PERL based.

What do I need to change?

Upvotes: 0

Views: 684

Answers (2)

Tezra
Tezra

Reputation: 8833

You want a not-capture group at the end and match line start/end like this

^http:\/\/www.example.com\/(.*)[^\/]$ (replace "match period or /" [.\/] with "not /" [^\/], and surround with ^$)

(You where so close!)

Add s? to make https? to allow an optional s if you don't care which protocol is being used.

Upvotes: 1

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 627607

To match URLs that do not end with /, use a negative lookbehind with an $ anchor like below:

http:\/\/www.example.com\/(.*)$(?<!\/)
                              ^^^^^^^^

$ will assert the position at the end of the string, and the lookbehind will fail the match if there is a slash. See this regex demo.

Another way is with a (?!.*\/$) lookahead:

http:\/\/www.example.com\/(?!.*\/$)(.*)
                          ^^^^^^^^^

See another regex demo.

The (?!.*\/$) negative lookahead will fail the match after finding out that there is / at the end of the string ($). Note that .* (matches any 0+ chars) is necessary to get to the end of the string, you cannot just use (?!\/$).

Upvotes: 1

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