URL正則表達式中的破折號

Question

我使用以下正則表達式從文本中獲取網址（例如"this is text http://url.com/blabla possibly some more text" ）。

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

這適用於所有URL，但我發現它不適用於縮短的URL，例如： "blabla bla http://ff.im/-bEnA blabla"在比賽后變為http://ff.im/ 。

我懷疑它做的破折號-斜線后/ 。

Answer 1

簡短答案： [\\w/_\\.]不匹配-因此將其設置為[-\\w/_\\.]

長答案：

@              - 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
@