URL正则表达式中的破折号

Question

I have used the following regex to get the urls from text (eg "this is text http://url.com/blabla possibly some more text" ).

'@(https?://([-\w\.]+)+(:\d+)?(/([\w/_\.]*(\?\S+)?)?)?)@'

This works for all URLs but I just found out it doesn't work for URLs shortened like: "blabla bla http://ff.im/-bEnA blabla" becomes http://ff.im/ after the match.

I suspect it has to do with the dash - after the slash / .

Answer 1

Short answer: [\\w/_\\.] doesn't match - so make it [-\\w/_\\.]

Long answer:

@              - delimiter
(              - start of group
    https?://  - http:// or https://
    ([-\w.]+)+ - capture 1 or more hyphens, word characters or dots, 1 or more times.. this seems odd - don't know what the second + is for
    (:\d+)?    - optionally capture a : and some numbers (the port)
    (          - start of group
        /            - leading slash
        (            - start of group
            [\w/_\.] - any word character, underscore or dot - you need to add hyphen to this list or just make it [^?\S] - any char except ? or whitespace (the path + filename)
            (\?\S+)? - optionally capture a ? followed by anything except whitespace (the querystring)
        )?     - close group, make it optional
    )?         - close group, make it optional
)              - close group
@