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<?php $str = "Foo *Bar\* asdf* Baz"; var_dump(preg_replace_callback('{\*([^\*]+)\*?}', function($matches) { var_dump($matches); return "<b>{$matches[1]}</b>"; }, $str));
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(6) "*Bar\*" [1]=> string(4) "Bar\" } array(2) { [0]=> string(5) "* Baz" [1]=> string(4) " Baz" } string(31) "Foo <b>Bar\</b> asdf<b> Baz</b>"

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