PHP正则表达式检测@twitter然后创建url

Question

I would like to detect a string with @account/status/postid

I have found a solution to detect the @account and create the link as such:

$str = preg_replace("/@(\w+)/", "<a href=\"http://www.twitter.com/\\1\" target=\"_blank\">@\\1</a>", $str);

However, I need the regular expression to include /status/postid and include this in the link, the final output should be:

<a href="http://www.twitter.com/account/status/postid" target="_blank">@account</a>

What I have tried (as I said I am completely lost and cannot find a solution online):

preg_replace("/@(\w+)/|$", "<a href=\"http://www.twitter.com/\\1\2\" target=\"_blank\">@\\1</a>", $str);

preg_replace("/@(\w+)/.\2", "<a href=\"http://www.twitter.com/\\1\2\" target=\"_blank\">@\\1</a>", $str);

preg_replace("/@(\w+)/./(\w+)", "<a href=\"http://www.twitter.com/\\1\2\" target=\"_blank\">@\\1</a>", $str);

preg_replace("/@(\w+)./(\w+)", "<a href=\"http://www.twitter.com/\\1\2\" target=\"_blank\">@\\1</a>", $str);

edit:

The structure of $str will be @TwitterAccountName/status/PostID

status will always be /status/, TwitterAccountName varies, as does PostID

The hypertext reference needs to be twitter.com/TwitterAccountName/status/PostID

The text within the anchor tags should just be @TwitterAccountName

What identifies the string as a twitter page that needs to be linked to, is the @

Answer 1

In case you are still interested in an answer, this should do the trick:

echo preg_replace(
     '|((@\w+)/\w+/\w+)|',
     '<a href="http://www.twitter.com/\\1" target="_blank">\\2</a>',
     $str);

Similar to chris85 I don't use twitter so I am not totally sure of the type of strings to expect for status and postid. I assume that they are made up of "word"-characters ( \\w ). You can of course change that if necessary.

One important difference from my regexp-string to yours is, that I delimited the actual regexp with a different character from / to | since the slash ( / ) would have to be masked all the time (like \\/ ) and that is very tedious ( preg_replace accepts any character as the regexp delimiter).

My test string

$str='this is a test sentence with a @twaccount/twstatus/twpostid and some more words afterwards.'

gets changed into:

'this is a test sentence with a <a target="_blank"
href="http://www.twitter.com/@twaccount/twstatus/twpostid"></a> 
and some more words afterwards.' // (no line breaks)

With preg_replace() the default behaviour is to replace all occurences of the search pattern. A global-flag like g in other regexp versions is not necessary (and will cause an error). A limit to the count of replacements can be set with an optional fourth parameter of the function.