api - PHP Twitter replace link and hashtag with real link -

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i looping on json response twitter api. each api response gives me tweet similar to:

hi name @john, , love #soccer, visit me

i trying replace @john, , insert <a href=http://twitter.com/john>@john</a> comma (,) after @john, problem.

how replace dots, commas, etc before , after tag?

$str = preg_replace("/@(\w+)/i", "<a href=\"http://twitter.com/$1\">$0</a>", $str);

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