$tweet = “this has a #hashtag a #badhash-tag and a #goodhash_tag”;
preg_match_all("/(#w+)/", $tweet, $matches);var_dump( $matches );*破折号是＃号的非法字符，允许带下划线。
$tweet = “this has a #hashtag a #badhash-tag and a #goodhash_tag”;
preg_match_all("/(#w+)/", $tweet, $matches);var_dump( $matches );*破折号是＃号的非法字符，允许带下划线。
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