如何在php中使用preg_match选择一个单词[复制]

I want to select a word that as hash using preg_match in php.

For Example consider this string:

Facebook has re-designed #timeline and it is out in New Zealand

Now I want to select #timeline how to do that, I use this code but it select only #t

preg_match_all("/#[a-zA-Z0-9]/")

Thanks in advance :)

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It's currently only set up to select a single character following the #. Try this:

preg_match_all("/#[a-zA-Z0-9]+/")